Add code lens for running tests

[Arcticae]

Problem

Out of the box it should support foundry runner (mainly) and perhaps standard cairo runner, preferably based on what's detected (can be implemented as a follow up to this task).

Example of implementation for other LSP/Extension:
Shopify/ruby-lsp#584

Reference of how it works with js:
https://code.visualstudio.com/docs/editor/testing

Example:

Proposed Solution

It needs to be researched and established scope of what's the MVP - and we can go from there

Notes

No response