Finished mypy type annotation fixes

[dskrypa]

Finished mypy type annotation fixes for #151

This PR also includes a new Param base class for all other Parameter classes that can be used as part of common, simple descriptor annotations for any Parameter type. Documentation updates related to this will be included in a future PR.

[codecov]

Codecov Report

❌ Patch coverage is 92.52336% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.24%. Comparing base (7e85aa0) to head (dd470fd).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/cli_command_parser/conversion/cli.py	0.00%	6 Missing ⚠️
lib/cli_command_parser/context.py	73.68%	1 Missing and 4 partials ⚠️
lib/cli_command_parser/commands.py	75.00%	4 Missing ⚠️
lib/cli_command_parser/parameters/base.py	77.77%	0 Missing and 4 partials ⚠️
lib/cli_command_parser/formatting/params.py	97.01%	0 Missing and 2 partials ⚠️
lib/cli_command_parser/parameters/options.py	96.36%	0 Missing and 2 partials ⚠️
lib/cli_command_parser/parameters/actions.py	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #154      +/-   ##
==========================================
- Coverage   97.40%   97.24%   -0.16%     
==========================================
  Files          52       52              
  Lines        7005     7036      +31     
  Branches     1119     1126       +7     
==========================================
+ Hits         6823     6842      +19     
- Misses        131      136       +5     
- Partials       51       58       +7     

Flag	Coverage Δ
unittests	97.20% <92.21%> (-0.18%)	⬇️

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