OpenTelemetry ETW Exporter

[psandana]

Fixes #15
Design discussion issue (if applicable)

Changes

Please provide a brief description of the changes here.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable) (Note: Partially added coverage for ~60%)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable) (Note: New code, New API)

[codecov]

Codecov Report

Attention: Patch coverage is 59.66543% with 217 lines in your changes are missing coverage. Please review.

Project coverage is 51.9%. Comparing base (eb0422a) to head (90fbf66).

Files	Patch %	Lines
opentelemetry-etw-logs/src/logs/exporter.rs	31.2%	207 Missing ⚠️
...emetry-etw-logs/src/logs/reentrant_logprocessor.rs	86.7%	9 Missing ⚠️
opentelemetry-etw-logs/src/logs/converters.rs	99.4%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #21     +/-   ##
=======================================
+ Coverage   51.0%   51.9%   +0.9%     
=======================================
  Files         34      37      +3     
  Lines       4358    4896    +538     
=======================================
+ Hits        2223    2544    +321     
- Misses      2135    2352    +217     

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[hdost]

Might want to make sure we have some windows testing in place for ETW
Example: https://github.com/rust-lang/rustfmt/blob/master/.github/workflows/windows.yml

[cijothomas]

Left some non-blocking comments. It is okay to merge now and address issues as follow ups.
I tested with logman and perfview and see logs flowing to etw.
Thanks!

[lalitb]

nit - Is there a particular reason we're leaning towards microbench rather than criterion, as otel-rust mainly sticks with criterion? Just curious, as it doesn’t necessarily mean we can’t explore using it here. :)

[lalitb]

Thanks. Nicely done :)