[Exporter.Console, Exporter.InMemory] Nullable

[Kielek]

Towards #3958

Changes

[Exporter.Console, Exporter.InMemory] Nullable

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• [ ] Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 86.20%. Comparing base (6250307) to head (cc4ce14).
Report is 284 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5765      +/-   ##
==========================================
+ Coverage   83.38%   86.20%   +2.81%     
==========================================
  Files         297      256      -41     
  Lines       12531    11102    -1429     
==========================================
- Hits        10449     9570     -879     
+ Misses       2082     1532     -550     

Flag	Coverage Δ
unittests	?
unittests-Project-Experimental	86.19% <0.00%> (?)
unittests-Project-Stable	86.19% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...xporter.Console/ConsoleExporterHelperExtensions.cs	0.00% <ø> (ø)
...porter.Console/ConsoleExporterLoggingExtensions.cs	0.00% <ø> (ø)
...porter.Console/ConsoleExporterMetricsExtensions.cs	0.00% <ø> (ø)
...penTelemetry.Exporter.InMemory/InMemoryExporter.cs	81.81% <ø> (ø)
...rter.InMemory/InMemoryExporterMetricsExtensions.cs	97.72% <ø> (ø)
...emetry.Exporter.Console/ConsoleActivityExporter.cs	48.33% <0.00%> (+0.05%)	⬆️
...elemetry.Exporter.Console/ConsoleMetricExporter.cs	0.00% <0.00%> (ø)
...xporter.Console/Implementation/ConsoleTagWriter.cs	11.11% <0.00%> (ø)
...metry.Exporter.Console/ConsoleLogRecordExporter.cs	0.00% <0.00%> (ø)

... and 202 files with indirect coverage changes

[CodeBlanch]

LGTM