Add WithCompression option to OTLP gRPC exporter

[huiyifyj]

Add a new WithCompression option to set the compression type for the OTLP gRPC exporter.
Add Compression type that wraps otlpconfig.Compression and define NoCompression and GzipCompression constants to specify compression options.

Make the compression option function of the OTLP gRPC exporter consistent with the OTLP HTTP exporter.

refer to https://github.com/open-telemetry/opentelemetry-go/blob/v1.35.0/exporters/otlp/otlptrace/otlptracehttp/options.go#L105

[linux-foundation-easycla]

• ✅login: huiyifyj / (d3c7276)

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[pellared]

Can you use https://pkg.go.dev/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc#WithCompressor instead?

[huiyifyj]

Can you use https://pkg.go.dev/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc#WithCompressor instead?

WithCompression and WithCompressor options have same effect indeed.
It's better to use WithCompression which has the same function signature as the HTTP exporter otlptracehttp.WithCompression options.

[pellared]

Sorry, but I do not understand why it would be better. Adding a new option that does already the same would confuse the users as they would not know which one it is better to use (and why). Moreover, we would be increasing the API surface that would need to be maintained.

Besides, are you aware that the added WithCompression is not working (using the option does not have any effect)?

[MrAlias]

@huiyifyj can you please provide justification for your previous assertion.