Add TapIgnore

[Daraan]

Adds a generic TapIgnore - which is a Annotated[T, _TapIgnoreMarker] which ignores arguments.

As it is just a generic Annotated should work without issues for type-checkers.

Resolves: #75
Closes: #170, #92

Question:
For IDEs it would be better to use TypeAliasType for TapIgnore.tap itself avoids using typing_extensions but it is in the dependency chain from typing-inspect - so it would be usable. Not sure how your stance is to use it or not.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 93.93939% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.21%. Comparing base (2e18dc8) to head (dd5b883).

Files with missing lines	Patch %	Lines
src/tap/tap.py	90.00%	2 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #171      +/-   ##
==========================================
- Coverage   94.45%   94.21%   -0.24%     
==========================================
  Files           4        4              
  Lines         721      743      +22     
==========================================
+ Hits          681      700      +19     
- Misses         40       43       +3     

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[Daraan]

Coverage skips two lines, they only way I see is to remove the double-check in _add_arguments - which is currently not necessary but I think they should be kept.

For the argument_buffer I am not sure If I can treat it the same.