[OneCollector] Support common schema extensions in json

[CodeBlanch]

Changes

• Adds support for sending common schema extensions in json serialization
• Adds support for sending dt (Distributed Tracing) extension when trace context is set on LogRecord

TODOs

• Appropriate CHANGELOG.md updated for non-trivial changes
• Changes in public API reviewed

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@d8ec6e0). Click here to learn what that means.
The diff coverage is 95.65%.

❗ Current head 76c22f8 differs from pull request most recent head e9aea6e. Consider uploading reports for the commit e9aea6e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1073   +/-   ##
=======================================
  Coverage        ?   70.86%           
=======================================
  Files           ?      212           
  Lines           ?     8082           
  Branches        ?        0           
=======================================
  Hits            ?     5727           
  Misses          ?     2355           
  Partials        ?        0           

Impacted Files	Coverage Δ
...ternal/Serialization/CommonSchemaJsonSerializer.cs	88.88% <71.42%> (ø)
...erialization/CommonSchemaJsonSerializationState.cs	97.01% <97.01%> (ø)
...ector/Internal/ExtensionFieldInformationManager.cs	100.00% <100.00%> (ø)
...lector/Internal/OneCollectorExporterEventSource.cs	29.16% <100.00%> (ø)
...rialization/CommonSchemaJsonSerializationHelper.cs	100.00% <100.00%> (ø)
...rialization/LogRecordCommonSchemaJsonSerializer.cs	98.93% <100.00%> (ø)
...orter.OneCollector/Internal/ThreadStorageHelper.cs	100.00% <100.00%> (ø)