[repo] Automatically add area labels when new issue is opened

[CodeBlanch]

[Modified @reyang's submission on #5600 to use powershell.]

Original content:

It'll look like this

I also tweaked the wording of the issue template (the original wording was copied from other opentelemetry repositories).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.52%. Comparing base (6250307) to head (8005e32).
Report is 213 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5601      +/-   ##
==========================================
+ Coverage   83.38%   85.52%   +2.14%     
==========================================
  Files         297      253      -44     
  Lines       12531    10890    -1641     
==========================================
- Hits        10449     9314    -1135     
+ Misses       2082     1576     -506     

Flag	Coverage Δ
unittests	?
unittests-Solution-Experimental	85.47% <ø> (?)
unittests-Solution-Stable	85.43% <ø> (?)
unittests-Unstable-Core	19.90% <ø> (?)

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see 124 files with indirect coverage changes

[reyang]

Not a blocker here, I actually feel this makes it harder to maintain as it cannot easily run on local dev box, editor/IDE don't have good support (e.g. how to debug) （anyways, I'm not the one who will maintain it so feel free to treat it as my subjective opinion)

[CodeBlanch]

I agree with you on this point! I'm going to circle back to this though. I'm sort of in the middle of improving the release process which is creating a lot of inline powershell scripts. Once that is stable I'll come back and see how it can all be cleaned up.