Add stale bot

[juancarlospaco]

What kind of change does this PR introduce?

• Add stale bot to mark issues and PRs as Stale after a long period of inactivity.
• Currently, it does NOT close issues automatically, but it can do so if wanted.
• Same yaml as Add stale bot supabase-py#774

Additional context

• https://github.com/actions/stale

[silentworks]

The tests here failing is unrelated to this PR. I will check out what is failing tomorrow or the weekend.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.54%. Comparing base (641c24e) to head (4942bee).
Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
- Coverage   84.36%   82.54%   -1.83%     
==========================================
  Files          12       12              
  Lines         467      487      +20     
==========================================
+ Hits          394      402       +8     
- Misses         73       85      +12     

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