feat: add support for OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT

[msierks-pcln]

User description

Fixes https://github.com/open-telemetry/opentelemetry-rust/discussions/2214

Changes

Add support for the OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT environment variable as explained in Opentelemetry SDK environment variable doc. This will truncate Value::String and Array::String attribute values if they exceed the limit.

• Adds TracerProviderBuilder::with_max_attribute_value_length()

Merge requirement checklist

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

[linux-foundation-easycla[bot]]

• :x: - login: @msierks-pcln / name: Michael Sierks . The commit (f7dc9cd080079dae475d8b5c4510ec653af95b2b) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 96.07843% with 6 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 80.2%. Comparing base (42139cb) to head (f7dc9cd).

Files with missing lines	Patch %	Lines
opentelemetry-sdk/src/trace/span.rs	93.4%	3 Missing :warning:
opentelemetry-sdk/src/trace/config.rs	66.6%	2 Missing :warning:
opentelemetry/src/common.rs	98.8%	1 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #3090     +/-   ##
=======================================
+ Coverage   80.1%   80.2%   +0.1%     
=======================================
  Files        126     126             
  Lines      21957   22109    +152     
=======================================
+ Hits       17603   17752    +149     
- Misses      4354    4357      +3     

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[cijothomas]

@msierks-pcln Can you sign the CLA, so we can consider contributions? It's a one-time process and is mandatory. If contributing on behalf of your employer, please do consult them before signing.

[msierks-pcln]

@msierks-pcln Can you sign the CLA, so we can consider contributions? It's a one-time process and is mandatory. If contributing on behalf of your employer, please do consult them before signing.

@cijothomas Yes, I'm working on this with my employer.