Add compressor SPI to support additional compression algos

[jack-berg]

Related to #5196.

I would say this closes the issue, but we might also consider adding a contrib artifact containing one or more popular alternatives to gzip.

If folks agree on the direction, I'll followup on this to extend support to the gRPC version of the OTLP exporters.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (0c436e0) 91.12% compared to head (97f7861) 91.13%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
.../exporter/internal/compression/CompressorUtil.java	84.61%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #5990   +/-   ##
=========================================
  Coverage     91.12%   91.13%           
- Complexity     5736     5742    +6     
=========================================
  Files           628      630    +2     
  Lines         16810    16844   +34     
  Branches       1662     1664    +2     
=========================================
+ Hits          15318    15350   +32     
- Misses         1028     1029    +1     
- Partials        464      465    +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jack-berg]

Draft PR to add a zstd implementation to contrib: open-telemetry/opentelemetry-java-contrib#1108

[jkwatson]

I think this seems like a great approach. One very small comment: it might be better not to pull in another test dependency, but just create a fake compressor (maybe one that just base64s or something if you want it to change the payload) for testing. Only better in that it's one less dependency that has to be maintained/upgraded/etc.

[jack-berg]

Nice suggestion. I pushed a commit to use base64 to test the mechanism and removed the lz4 dependency.

[jkwatson]

👍🏽