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 (ece434b).
⚠️ Report is 2 commits behind head on master.

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.

[gmlewis]

Thank you, @Not-Dhananjay-Mishra and @alexandear!
LGTM.
Merging.