Docs: Document the HrTime format

[JamesJHPark]

Which problem is this PR solving?

This PR is to address and document the HrTime format, HrTime = [number, number], to specify the representation of the first and second number.

Fixes #2578

Short description of the changes

This PR has documented the HrTime format.

Type of change

Please delete options that are not relevant.

• This change requires a documentation update

How Has This Been Tested?

N/A

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

[codecov]

Codecov Report

Merging #2604 (cc7afd2) into main (491dd80) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2604      +/-   ##
==========================================
+ Coverage   93.00%   93.02%   +0.01%     
==========================================
  Files         138      138              
  Lines        5092     5092              
  Branches     1095     1095              
==========================================
+ Hits         4736     4737       +1     
+ Misses        356      355       -1     

Impacted Files	Coverage Δ
packages/opentelemetry-core/src/common/time.ts	95.38% <ø> (ø)
...emetry-core/src/platform/node/RandomIdGenerator.ts	93.75% <0.00%> (+6.25%)	⬆️

[dyladan]

Thanks for the contribution

[Flarna]

Would be cool to have this doc also in API (e.g. https://github.com/open-telemetry/opentelemetry-js-api/blob/a752e7f814e7b335e50705d281cb2c6e1bd38a35/src/common/Time.ts#L16)

[dyladan]

Would be cool to have this doc also in API (e.g. open-telemetry/opentelemetry-js-api@a752e7f/src/common/Time.ts#L16)

@JamesJHPark you mind documenting the type there also?

[JamesJHPark]

Would be cool to have this doc also in API (e.g. open-telemetry/opentelemetry-js-api@a752e7f/src/common/Time.ts#L16)

@JamesJHPark you mind documenting the type there also?

Yes, definitely! I will document and update it in opentelemetry-js-api.

[dyladan]

I cannot merge branches that are out of date with the main branch. Please update this branch and I will merge it