Fix ty unresolved-attribute warnings and add mypy back

[tleonhardt]

Add mypy back in addition to ty for type checking.

Also fixes ty unresolved-attribute warnings and stop globally ignoring them within ty.toml.

Major changes:

• Add mypy back so now both ty and mypy are used for type checking - each are better at some things
• Convert BoundCommandFunc and UnboundCommandFunc TypeAliases in types.py to Protocol classes for stricter type checking
• Added _CommandFunc type alias in annotated.py based on BoundCommandFunc and UnboundCommandFunc
• Used getattr and/or cast() to help resolve some type errors in cmd2.py

Minor changes:

• Added type ignore for ty:unresolved-attribute to a number of places we were already ignoring attr-defined for mypy (problem of different name for same type of check)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.64%. Comparing base (5dcbcbe) to head (9699b2b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1737      +/-   ##
==========================================
- Coverage   99.66%   99.64%   -0.02%     
==========================================
  Files          23       23              
  Lines        5937     5960      +23     
==========================================
+ Hits         5917     5939      +22     
- Misses         20       21       +1     

Flag	Coverage Δ
unittests	99.64% <100.00%> (-0.02%)	⬇️

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[tleonhardt]

@KelvinChung2000 Could you please review the changes in annotated.py? There this is mostly replacing every Callable[..., Any] type hint with a type alias: _CommandFunc: TypeAlias = BoundCommandFunc | UnboundCommandFunc[CmdOrSetT, Any] so it is more in line with type hints elsewhere in the codebase.

@kmvanbrunt Could you please review changes outside of annotated.py? For this there are two main changes:

1. Account for ty calling what mypy called attr-defined, unresolved-attribute instead.
2. Converted BoundCommandFunc and UnboundCommandFunc from simple type alias to Protocol classes which do a better job of type hinting that certain attributes have to exist (duck typing)

[tleonhardt]

@KelvinChung2000 @kmvanbrunt Ok, I think this is ready for another review.

I ended up adding mypy back to our type checking in addition to ty because each of them are stricter about checking some things than the other.