added version.go and test file for issue 2143

[ChillOrb]

1. As per #2143 , added un-exported func version() for sdk/metrics and sdk/trace and added test cases in the same sdk module.

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: ChillOrb / name: Rakshit Parashar (9ef3922f7f7c68e1b8ae440384d0343af1152d13)

[codecov[bot]]

Codecov Report

Merging #3677 (847d7ac) into main (7971a12) will decrease coverage by 0.1%. The diff coverage is 100.0%.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #3677     +/-   ##
=======================================
- Coverage   82.8%   82.8%   -0.1%     
=======================================
  Files        177     179      +2     
  Lines      13494   13498      +4     
=======================================
+ Hits       11178   11180      +2     
- Misses      2095    2097      +2     
  Partials     221     221             

Impacted Files	Coverage Δ
sdk/metric/version.go	100.0% <100.0%> (ø)
sdk/trace/version.go	100.0% <100.0%> (ø)

... and 1 file with indirect coverage changes

[ChillOrb]

Added license info in sdk/metric/version_test.go

[pellared]

@open-telemetry/go-instrumentaiton-maintainers I think this is good to merge.

[pellared]

Lint failing: https://github.com/open-telemetry/opentelemetry-go/actions/runs/4328860180/jobs/7570921576