Add OTel logs design placeholder

[pellared]

Towards #4696

The design doc template is taken from https://github.com/golang/proposal/blob/master/design/TEMPLATE.md.

[codecov]

Codecov Report

Merging #4697 (a3ef6a6) into main (0c5ebd5) will decrease coverage by 0.1%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            main   #4697     +/-   ##
=======================================
- Coverage   81.8%   81.8%   -0.1%     
=======================================
  Files        225     225             
  Lines      18087   18087             
=======================================
- Hits       14798   14796      -2     
- Misses      2992    2994      +2     
  Partials     297     297             

see 1 file with indirect coverage changes

[MrAlias]

I do not support adding another Go module to this repository for a design doc.

[MadVikingGod]

I'm not in support of adding another module or anything that would be picked up by documentation sites. This would be something that adds to the list of dead links at https://pkg.go.dev/go.opentelemetry.io/otel

[pellared]

I see the problem.... Someone can simply "request" even without a tag.

It would be better to place it in a separate repository.

[pellared]

@MadVikingGod @MrAlias Thank you 👍