createServicePolicy: Convert callbacks to methods

Both RetryPolicy and CircuitBreakerPolicy from the Cockatiel library
allow for listening for events using `on*` methods. Our "service policy"
allows for listening to some of the same events as well as the
"degraded" event. For parity with Cockatiel — and for easier use in
general — this commit removes the callbacks that `createServicePolicy`
takes and replaces them with `on*` methods.

packages/controller-utils/CHANGELOG.md

@@ -9,8 +9,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- Add `createServicePolicy` function to assist with reducing boilerplate for service classes ([#5154](https://github.com/MetaMask/core/pull/5154), [#5143](https://github.com/MetaMask/core/pull/5143), [#5149](https://github.com/MetaMask/core/pull/5149))
-  - Also add `DEFAULT_CIRCUIT_BREAK_DURATION`, `DEFAULT_DEGRADED_THRESHOLD`, `DEFAULT_MAX_CONSECUTIVE_FAILURES`, and `DEFAULT_MAX_RETRIES` constants and `IServicePolicy` type
+- Add utility function for reducing boilerplate for service classes ([#5154](https://github.com/MetaMask/core/pull/5154), [#5143](https://github.com/MetaMask/core/pull/5143), [#5149](https://github.com/MetaMask/core/pull/5149), [#5188](https://github.com/MetaMask/core/pull/5188))
+  - Add function `createServicePolicy`
+  - Add constants `DEFAULT_CIRCUIT_BREAK_DURATION`, `DEFAULT_DEGRADED_THRESHOLD`, `DEFAULT_MAX_CONSECUTIVE_FAILURES`, and `DEFAULT_MAX_RETRIES`
+  - Add types `ServicePolicy` and `CreateServicePolicyOptions`
 
 ## [11.4.5]