feat(Calendar): support text slot

[yuyinws]

Sometimes, we want to custom the text render on calendar, like this:

This PR add a new text slot to implement it.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.78%. Comparing base (1f24cbc) to head (dea9e0b).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13127      +/-   ##
==========================================
- Coverage   93.81%   93.78%   -0.03%     
==========================================
  Files         257      257              
  Lines        6999     7001       +2     
  Branches     1730     1731       +1     
==========================================
  Hits         6566     6566              
- Misses        377      379       +2     
  Partials       56       56              

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[mice33]

I'm really looking forward to this feature getting merged and shipped soon!

[chenjiahan]

Thank you! Sorry I was a bit busy the last two weeks, I will release a new version today