Bugfix/consistent help formatting

[BrianPugh]

Features

• Added a new App.help_format type, "rich", which renders rich markup.

Bug Fixes

• The App.help_format field is now uniformly applied across all components of the help-page. Addresses the help format parsing is not consistent #113

Compromises

• In the help-page, added components to Parameters' help like [required: True] will no longer be stylized in markdown and restructuredtext formatted help pages.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.10345% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 96.40%. Comparing base (7aafc8e) to head (444439e).

Files	Patch %	Lines
cyclopts/help.py	94.59%	2 Missing and 2 partials ⚠️
cyclopts/core.py	84.61%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
+ Coverage   96.25%   96.40%   +0.15%     
==========================================
  Files          16       16              
  Lines        1815     1864      +49     
  Branches      457      468      +11     
==========================================
+ Hits         1747     1797      +50     
+ Misses         31       29       -2     
- Partials       37       38       +1     

Flag	Coverage Δ
unittests	96.19% <93.10%> (+0.15%)	⬆️

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[BrianPugh]

@OrHayat could you give this branch a test and see if it resolves your issues from #113? Thanks!