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.

Additional context

• https://github.com/actions/stale

[sourcery-ai]

Hey @juancarlospaco - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 2 issues found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Docstrings: all looks good

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[sourcery-ai]

suggestion (code_refinement): Setting days-before-pr-close to -1 may need reevaluation.

Consider the implications of never automatically closing stale PRs. If this is intentional, it's fine; otherwise, setting a positive number might be more appropriate.

Suggested change

	days-before-pr-close: -1
	days-before-pr-close: 30

[sourcery-ai]

suggestion (code_refinement): Review the setting for days-before-issue-close.

Setting this to -1 means issues will never be closed automatically. Ensure this aligns with your project management strategies.

Suggested change

	days-before-issue-close: -1
	days-before-issue-close: 30

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.76%. Comparing base (819ba63) to head (98032c5).
Report is 39 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #774       +/-   ##
===========================================
+ Coverage   43.97%   64.76%   +20.78%     
===========================================
  Files          13       13               
  Lines         332      315       -17     
===========================================
+ Hits          146      204       +58     
+ Misses        186      111       -75     

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