[WIP] Fix type annotations for Pandas.core.indexes.datetimelike

[vaibhavhrt]

• closes Fix type annotations for pandas.core.indexes.datetimelike #26364
• tests passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[vaibhavhrt]

Errors that still remain are:

pandas\core\indexes\datetimelike.py:66: error: "Callable[[Any], Any]" has no attribute "fget"
pandas\core\indexes\datetimelike.py:67: error: "Callable[[Any], Any]" has no attribute "fget"
pandas\core\indexes\datetimelike.py:68: error: "Callable[[Any], Any]" has no attribute "fget"
pandas\core\indexes\datetimelike.py:70: error: "Callable[[Any], Any]" has no attribute "fget"
pandas\core\indexes\datetimelike.py:71: error: "Callable[[Any], Any]" has no attribute "fget"
pandas\core\indexes\datetimelike.py:208: error: Name '_box_values' already defined on line 73

Errors related to fget doesn't seem to have any solution yet(see python/mypy#6185 and linked mypy issues in its comments). Maybe we should ignore it for now.

@WillAyd need some insight on why _box_values is declared twice and how to annotate it, or maybe ignore it too.

btw mypy tests will fail, so maybe someone with access to azure pipelines should cancel the tests to allow tests from PR(if any) to run.

[codecov]

Codecov Report

Merging #26365 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #26365      +/-   ##
==========================================
- Coverage   91.68%   91.68%   -0.01%     
==========================================
  Files         174      174              
  Lines       50700    50701       +1     
==========================================
- Hits        46486    46483       -3     
- Misses       4214     4218       +4

Flag	Coverage Δ
#multiple	90.18% <100%> (ø)	⬆️
#single	41.17% <100%> (-0.18%)	⬇️

Impacted Files	Coverage Δ
pandas/core/indexes/datetimelike.py	98.14% <100%> (ø)	⬆️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.01% <0%> (-0.12%)	⬇️

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[WillAyd]

There is already an open PR for this one so closing this as a duplicate

[vaibhavhrt]

my bad, didn't saw that