Proto logs exporter class name inconsistent with other logs exporters

[Vunovati]

There is a naming inconsistency in the @opentelemetry/exporter-logs-otlp-proto package, identical to #3812

First mentioned in this commit: #3764 (comment)

I originally posted the comment in the existing issue that was closed, but this is actually a different package so it should be tracked separately.

Seems like this problem is still present: main/experimental/packages/exporter-logs-otlp-proto/src/platform/node/OTLPLogsExporter.ts#L40 (blame)

@Vunovati ah yes, that's a different exporter; please open a new issue so that we can track it separately.

Originally posted by @pichlermarc in #3812 (comment)