Logs API/SDK - few perf improvements

[lalitb]

Fixes #

Changes

Few perf improvements in logs api/sdk picked from the recent changes in tracing api/sdk by @shaun-cox ( #1093 and #1129), so:

• change sdk:::Logger to hold Arc instead of whole InstrumentationLib instance, so cloning logger instance is much cheaper.
• API to returns a new versioned logger with the given instrumentation library. This will allow user to share the instrumentation library with multiple loggers.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.1 ⚠️

Comparison is base (fa37b99) 49.8% compared to head (ab2938c) 49.8%.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1134     +/-   ##
=======================================
- Coverage   49.8%   49.8%   -0.1%     
=======================================
  Files        171     171             
  Lines      20238   20253     +15     
=======================================
  Hits       10092   10092             
- Misses     10146   10161     +15     

Impacted Files	Coverage Δ
opentelemetry-api/src/global/logs.rs	0.0% <0.0%> (ø)
opentelemetry-api/src/logs/logger.rs	0.0% <0.0%> (ø)
opentelemetry-api/src/logs/noop.rs	0.0% <0.0%> (ø)
opentelemetry-sdk/src/logs/log_emitter.rs	0.0% <0.0%> (ø)

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[djc]

@shaun-cox could help review this?

[shaun-cox]

Thanks for bringing this over!