docs: add TextEditor ADR

[connorhaugh]

This ADR proposes a Paragon TextEditor component as a pass through of Tinymce, an existing WYSIWIG text editor, with standardization. This follows the suggested reverse process for engineers to submit things to pwg

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Codecov Report

Merging #1131 (065ece6) into master (66438b6) will increase coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1131      +/-   ##
==========================================
+ Coverage   90.59%   90.64%   +0.04%     
==========================================
  Files         190      191       +1     
  Lines        2989     3013      +24     
  Branches      657      666       +9     
==========================================
+ Hits         2708     2731      +23     
- Misses        268      269       +1     
  Partials       13       13              

Impacted Files	Coverage Δ
src/Menu/SelectMenu.jsx	63.49% <0.00%> (ø)
src/Sticky/index.jsx	95.83% <0.00%> (ø)

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[muselesscreator]

I believe this makes sense in the long term, but for the short-term, the team needs w/rt the tinyMCE installation are going to leave them with a much less configurable option than we would want for Paragon consumption, and the TnL squad will not have the bandwidth to continue pressing on this from a component standardization perspective, so that work will need to get forwarded to the FWG or PWG for future ownership.

[adamstankiewicz]

Following up on the previous offline discussions in Frontend/Paragon Working Groups, we decided we'd defer on considering a TextEditor component in Paragon, at least one that consumes TinyMCE (especially needing to support paid plugins).

That said, it may be interesting if Paragon one day supported its own custom text editor component that didn't rely on TinyMCE, but instead something like https://github.com/facebook/lexical.

As a result, I'm inclined to close the PR for now, though we'll definitely be considering whether a text editor makes sense on the long term roadmap for Paragon.

@connorhaugh If you disagree, please feel to re-open the issue 😄 Thanks!