chore: expand pull request template with action items

[pragmaticivan]

Which problem is this PR solving?

• From Sep 29th, 2021 meeting. This Pr introduces some Action Items to remind contributors and help reviewers with broader changes that might include documentation updates and perhaps how to replicate something.

[pragmaticivan]

It might make sense to incorporate the hidden/commented messages in this PR somehow?

[codecov]

Codecov Report

Merging #2509 (9b1ed94) into main (f2a5624) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2509      +/-   ##
==========================================
- Coverage   93.06%   93.05%   -0.01%     
==========================================
  Files         132      139       +7     
  Lines        4856     5172     +316     
  Branches     1040     1110      +70     
==========================================
+ Hits         4519     4813     +294     
- Misses        337      359      +22     

Impacted Files	Coverage Δ
packages/opentelemetry-sdk-trace-web/src/utils.ts	94.90% <0.00%> (ø)
...entelemetry-sdk-trace-web/src/WebTracerProvider.ts	100.00% <0.00%> (ø)
...telemetry-sdk-trace-web/src/StackContextManager.ts	94.28% <0.00%> (ø)
...-sdk-trace-web/src/enums/PerformanceTimingNames.ts	100.00% <0.00%> (ø)
...ry-context-zone-peer-dep/src/ZoneContextManager.ts	85.18% <0.00%> (ø)
...es/opentelemetry-context-zone-peer-dep/src/util.ts	100.00% <0.00%> (ø)
packages/opentelemetry-sdk-trace-web/src/types.ts	100.00% <0.00%> (ø)

[dyladan]

The commented lines only show up to the person who is authoring the PR. They are hidden if the PR author leaves it it when they click submit.

[rauno56]

Yep, if any, those instructions could be hidden comments, because they don't add much for the reader.

What I've personally found, is that the checklists are useful in only occasionally(which IMHO talks for them - such a simple means for some benefit). I hope people just take those as reminders and nothing to religiously follow. If we really have a strong rule, we should be able to automate enforcing it as "following guidelines" is enforced by the linter.