[SDK] Support LoggerConfigurator updates and example

[dbarker]

Fixes # (issue)

Adds the ability to update a LoggerConfigurator (and existing loggers' LoggerConfig) at runtime. Following the pattern used in #4065.

This implements the optional requirement to allow updating the LoggerProvider's LoggerConfigurator : https://opentelemetry.io/docs/specs/otel/logs/sdk/#loggerconfigurator

Changes

• Adds UpdateLoggerConfigurator to LoggerProvider to support setting new logger configs at runtime
• Adds test and an example

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

❌ Patch coverage is 94.28571% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.81%. Comparing base (f7120b3) to head (12c33e7).

Files with missing lines	Patch %	Lines
sdk/src/logs/logger_context.cc	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4224      +/-   ##
==========================================
+ Coverage   82.79%   82.81%   +0.03%     
==========================================
  Files         415      415              
  Lines       17452    17472      +20     
==========================================
+ Hits        14447    14468      +21     
+ Misses       3005     3004       -1     

Files with missing lines	Coverage Δ
sdk/src/logs/logger.cc	90.52% <100.00%> (+0.43%)	⬆️
sdk/src/logs/logger_provider.cc	91.08% <100.00%> (+1.95%)	⬆️
sdk/src/logs/logger_context.cc	93.94% <60.00%> (-6.06%)	⬇️

... and 2 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.