Remove dependency to all exporters in SDK

[Flarna]

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Followup on https://github.com/open-telemetry/opentelemetry-js/issues/4145

I think we should remove the dependency to all exporters from SDK similar as it was done for Jaeger in https://github.com/open-telemetry/opentelemetry-js/pull/4049.

The OTLP exporters include quite some transitive dependencies like grpc which are often not needed. This results in unneeded long installation time, unneeded high disc size/bundle size. There might be more like longer startup time, higher memory consumption just because unneeded stuff is read and code is held in memory.