refactor: Chat endpoints to use AJV schemas

[KevLehman]

Proposed changes (including videos or screenshots)

Issue(s)

https://rocketchat.atlassian.net/browse/CORE-293

Steps to test or reproduce

Further comments

[dionisio-bot]

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Latest commit: 11e3954

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.44%. Comparing base (d4f6aa1) to head (11e3954).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #35210   +/-   ##
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  Coverage    59.44%   59.44%           
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  Files         2827     2827           
  Lines        68162    68162           
  Branches     15123    15123           
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  Hits         40516    40516           
  Misses       24990    24990           
  Partials      2656     2656           

Flag	Coverage Δ
unit	75.69% <ø> (ø)

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[KevLehman]

/bark

[dionisio-bot]

woof