add RM style checks

[Nytelife26]

This relates to...

The splitting of PR #802.

Before this PR can be processed, the checks must be recategorized
into their appropriate locations rather than by author.

Rationale

TO BE DONE.

Changes

TO BE DONE.

Features

TO BE DONE.

Bug Fixes

TO BE DONE.

Breaking Changes and Deprecations

TO BE DONE.

[codecov]

Codecov Report

Merging #1187 (09fe7ea) into main (c17ad87) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1187      +/-   ##
==========================================
+ Coverage   94.72%   94.79%   +0.06%     
==========================================
  Files          83       85       +2     
  Lines        1213     1229      +16     
==========================================
+ Hits         1149     1165      +16     
  Misses         64       64              

Flag	Coverage Δ
macos-latest	94.79% <100.00%> (+0.06%)	⬆️
py3.6	94.28% <100.00%> (+0.07%)	⬆️
py3.7	94.28% <100.00%> (+0.07%)	⬆️
py3.8	94.79% <100.00%> (+0.06%)	⬆️
py3.9	94.79% <100.00%> (+0.06%)	⬆️
pypypy3	94.28% <100.00%> (+0.07%)	⬆️
ubuntu-latest	94.79% <100.00%> (+0.06%)	⬆️
windows-latest	94.79% <100.00%> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
proselint/checks/mccarl/rm_style_exist_check.py	100.00% <100.00%> (ø)
proselint/checks/mccarl/rm_style_pref_forms.py	100.00% <100.00%> (ø)

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[github-actions]

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 #  from Dangerfile:2
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 #  # Look for prose issues
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