Remove API for Creating Histograms with signed integers.

[lalitb]

Fixes #
As per the otel specs, the value to be recorded with histogram instrument should be non-negative. So removing the existing method to record signed integer values.

The value is expected to be non-negative. This API SHOULD be documented in a way to communicate to users that this value is expected to be non-negative. This API SHOULD NOT validate this value, that is left to implementations of the API.

Changes

Please provide a brief description of the changes here.

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)

[jtescher]

Always nice to support a smaller API surface, can we get a changelog entry?

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (59728c8) 55.3% compared to head (ae9a3a9) 55.4%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
opentelemetry-otlp/src/exporter/tonic/mod.rs	74.0%	7 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1371   +/-   ##
=====================================
  Coverage   55.3%   55.4%           
=====================================
  Files        147     147           
  Lines      18119   18085   -34     
=====================================
- Hits       10035   10021   -14     
+ Misses      8084    8064   -20     

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