zstd compression for tonic exporter

[harscoet]

Changes

Zstd compression can be used with tonic https://docs.rs/tonic/0.12.1/tonic/codec/enum.CompressionEncoding.html#variant.Zstd

It is the recommended compression algorithm for NewRelic https://docs.newrelic.com/docs/opentelemetry/best-practices/opentelemetry-otlp/

Additionally, you should enable compression to reduce payload size and limit the likelihood of encountering payload size limits. New Relic supports gzip and zstd compression. zstd compression is higher performance and recommended if your exporter supports it. See compression comparison for more details on benchmark information.

As this requires a feature, I changed the error message for FeatureRequiredForCompressionAlgorithm to have a more detailed error

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

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

Project coverage is 74.9%. Comparing base (a1f02fa) to head (3d496e7).

Files	Patch %	Lines
opentelemetry-otlp/src/exporter/mod.rs	0.0%	2 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1947   +/-   ##
=====================================
  Coverage   74.9%   74.9%           
=====================================
  Files        122     122           
  Lines      20370   20375    +5     
=====================================
+ Hits       15273   15277    +4     
- Misses      5097    5098    +1     

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[cijothomas]

LGTM with a changelog entry.