[InMemoryExporter] Throw ObjectDisposedException if Export happened after disposal

[reyang]

Related to #1848 and #3578.

This should help the developers catch the bugs during the development / unit testing.

[codecov]

Codecov Report

Merging #3607 (61dfb7e) into main (4310e08) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3607      +/-   ##
==========================================
+ Coverage   87.12%   87.22%   +0.09%     
==========================================
  Files         277      277              
  Lines        9944     9950       +6     
==========================================
+ Hits         8664     8679      +15     
+ Misses       1280     1271       -9     

Impacted Files	Coverage Δ
...etheus.HttpListener/Internal/PrometheusExporter.cs	100.00% <ø> (ø)
...penTelemetry.Exporter.InMemory/InMemoryExporter.cs	94.73% <100.00%> (+2.42%)	⬆️
src/OpenTelemetry/Logs/Pool/LogRecordSharedPool.cs	78.94% <0.00%> (-21.06%)	⬇️
...emetry.Api/Internal/OpenTelemetryApiEventSource.cs	73.52% <0.00%> (-8.83%)	⬇️
src/OpenTelemetry/BatchExportProcessor.cs	82.24% <0.00%> (-1.87%)	⬇️
...tpListener/Internal/PrometheusCollectionManager.cs	80.48% <0.00%> (+2.43%)	⬆️
...metryProtocol/Implementation/ActivityExtensions.cs	96.15% <0.00%> (+4.39%)	⬆️
...tation/OpenTelemetryProtocolExporterEventSource.cs	85.00% <0.00%> (+10.00%)	⬆️
...xporter.OpenTelemetryProtocol/OtlpTraceExporter.cs	77.27% <0.00%> (+18.18%)	⬆️
...entation/ExportClient/OtlpGrpcTraceExportClient.cs	78.57% <0.00%> (+28.57%)	⬆️
... and 1 more

[reyang]

I thought this would be useful, and it came too fast:

[CodeBlanch]

LGTM