feat: add instrumentation version for instrument config.

[TommyCpp]

Working on the otel metrics exporter. Think we should include instrumentation version in metrics as we did in tracing.

[codecov]

Codecov Report

Merging #392 (415affd) into master (4390213) will decrease coverage by 0.09%.
The diff coverage is 16.66%.

@@            Coverage Diff             @@
##           master     #392      +/-   ##
==========================================
- Coverage   49.42%   49.32%   -0.10%     
==========================================
  Files          66       66              
  Lines        5356     5368      +12     
==========================================
+ Hits         2647     2648       +1     
- Misses       2709     2720      +11     

Impacted Files	Coverage Δ
opentelemetry/src/api/metrics/config.rs	22.58% <16.66%> (-9.00%)	⬇️

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[jtescher]

looks good