feat: Add support for Codespace Machines APIs

[Not-Dhananjay-Mishra]

Relates: #2362
This PR adds support for endpoint of Codespace Machines

• GET /repos/{owner}/{repo}/codespaces/machines
• GET /user/codespaces/{codespace_name}/machines

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.54%. Comparing base (e10040d) to head (6c1bb0d).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3890      +/-   ##
==========================================
+ Coverage   92.53%   92.54%   +0.01%     
==========================================
  Files         200      201       +1     
  Lines       14709    14732      +23     
==========================================
+ Hits        13611    13634      +23     
  Misses        897      897              
  Partials      201      201              

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[gmlewis]

Thank you, @Not-Dhananjay-Mishra!
Just a few tweaks, please, then we should be ready for a second LGTM+Approval from any other contributor to this repo before merging.

cc: @stevehipwell - @alexandear - @zyfy29

[Not-Dhananjay-Mishra]

@gmlewis Thanks for suggestions! I’ve made the changes.