docs(doc): Add vale doc linter as a GitHub workflow.

[jeroenleenarts]

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🎯 Goal

Adds Vale doc linter to the GitHub workflow. This uses the Google defined documentation config making sure the documentation of the SDK will gradually be clear of easy to miss spelling errors and other typical small issues.

🛠 Implementation details

Uses Vale.sh with it's associated GH Action. More info on the tool can be read on mentioned URL.

🎨 UI Changes

No UI changes to the SDK. Just a feedback mechanism on pull request on markdown files that are actually touched in a pull request.

[codecov]

Codecov Report

Base: 83.46% // Head: 83.51% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (1bc54a6) compared to base (0441789).
Patch has no changes to coverable lines.

❗ Current head 1bc54a6 differs from pull request most recent head 65b2d88. Consider uploading reports for the commit 65b2d88 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1859      +/-   ##
===========================================
+ Coverage    83.46%   83.51%   +0.04%     
===========================================
  Files          259      259              
  Lines         6410     6404       -6     
  Branches      1806     1798       -8     
===========================================
- Hits          5350     5348       -2     
+ Misses         891      889       -2     
+ Partials       169      167       -2     

Impacted Files	Coverage Δ
src/utils.tsx	79.10% <0.00%> (-0.16%)	⬇️
src/components/Channel/Channel.tsx	81.02% <0.00%> (+0.64%)	⬆️
...rc/components/MessageInput/hooks/useUserTrigger.ts	72.46% <0.00%> (+1.03%)	⬆️
...components/MessageInput/hooks/useCooldownTimer.tsx	83.33% <0.00%> (+1.51%)	⬆️

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