chore: add issue and pr templates

.github/ISSUE_TEMPLATE/bugs.yaml

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+name: Bug Report
+description: Report a bug in the existing codebase.
+title: '[Bug]: '
+labels: ['kind/bug', 'pending-triage']
+body:
+    - type: markdown
+      attributes:
+        value: |
+              Please use this template while reporting a bug and provide as much information as possible. If the matter is security related, please disclose it privately, see the project [security policy](https://github.com/kubernetes-monitoring/kubernetes-mixin/blob/main/SECURITY.md).
+    - type: textarea
+      id: cause
+      attributes:
+        label: What happened?
+        description: A clear and concise description of what the bug is. Screenshots and screencasts are highly encouraged and helpful during triage, so please provide them if you can.
+        placeholder: Describe the bug you encountered. Please do not paste any snippets here, use the next field instead.
+      validations:
+        required: true
+    - type: textarea
+      id: snippet
+      attributes:
+        label: Please provide any helpful snippets.
+        description: If applicable, add code snippet(s) to help explain or reproduce the problem. This will be automatically formatted into code, so no need for backticks. Separate snippets using comments.
+        render: jsonnet
+    - type: dropdown
+      id: contamination
+      attributes:
+        label: What parts of the codebase are affected?
+        description: Select all that apply.
+        multiple: true
+        options:
+          - Alerts
+          - Dashboards
+          - Rules
+          - Other
+      validations:
+        required: true
+    - type: checkboxes
+      id: terms
+      attributes:
+        label: "I agree to the following terms:"
+        options:
+        - label: I agree to follow this project's [Code of Conduct](../../CODE_OF_CONDUCT.md).
+          required: true
+        - label: I have filled out all the required information above to the best of my ability.
+          required: true
+        - label: I have searched the issues of this repository and believe that this is not a duplicate.
+          required: true
+        - label: I have confirmed this bug exists in the default branch of the repository, as of the latest commit at the time of submission.
+          required: true

.github/ISSUE_TEMPLATE/enhancements.yaml

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+name: Enhancement Proposal
+description: Propose an enhancement for the existing codebase.
+title: '[Enhancement]: '
+labels: ['kind/enhancement', 'pending-triage']
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please use this template while proposing an enhancement and provide as much information as possible. If this is a feature request, please ensure that [a consensus has been reached](https://github.com/kubernetes-monitoring/kubernetes-mixin/blob/master/CONTRIBUTING.md?plain=1#L24) before submitting.
+  - type: textarea
+    id: idea
+    attributes:
+      label: What's the general idea for the enhancement?
+      description: A clear and concise description of what the enhancement targets. Screenshots and screencasts are highly encouraged and helpful during triage, so please provide them if you can.
+      placeholder: Describe the need for this enhancement. Please do not paste any snippets here, use the next field instead.
+    validations:
+      required: true
+  - type: textarea
+    id: snippet
+    attributes:
+      label: Please provide any helpful snippets.
+      description: If applicable, add code snippet(s) to help explain or reproduce the problem. This will be automatically formatted into code, so no need for backticks. Separate snippets using comments.
+      render: jsonnet
+  - type: dropdown
+    id: contamination
+    attributes:
+      label: What parts of the codebase does the enhancement target?
+      description: Select all that apply.
+      multiple: true
+      options:
+        - Alerts
+        - Dashboards
+        - Rules
+        - Other
+    validations:
+      required: true
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: "I agree to the following terms:"
+      options:
+        - label: I agree to follow this project's [Code of Conduct](../../CODE_OF_CONDUCT.md).
+          required: true
+        - label: I have filled out all the required information above to the best of my ability.
+          required: true
+        - label: I have searched the issues of this repository and believe that this is not a duplicate.
+          required: true
+        - label: I have confirmed this proposal applies to the default branch of the repository, as of the latest commit at the time of submission.
+          required: true

.github/PULL_REQUEST_TEMPLATE/prs.md

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+<!--  Thank you for sending a pull request! We highly appreciate contributions. Here are some tips for you:
+1. If this is your first time, read our contributor guidelines: https://github.com/kubernetes-monitoring/kubernetes-mixin/blob/master/CONTRIBUTING.md
+2. If you want *faster* PR reviews, read how: https://git.k8s.io/community/contributors/guide/pull-requests.md#best-practices-for-faster-reviews
+3. If the PR is unfinished, please mark it as a draft, to prevent false pings and noisy review cycles.
+-->
+
+**What does this PR fix? Please be as descriptive as possible.**:
+
+**Code snippets or visual aids (screenshots and/or screencasts) before and after this patch (if applicable)**:
+<details>
+<summary>Details</summary>
+
+<!-- Please provide code snippets or visual aids to help explain the changes you're making. These are highly helpful and help accelerate reviews. -->
+
+</details>
+
+<!-- Please append the issue(s) this PR targets below this line -->
+Fixes #