Update proto versions of OTLP exporters

[pichlermarc]

In #2871 the OTLP Metrics Exporters were updated to the latest SDK.
This issue includes a few linked items that can be split up into multiple PRs.

Ideally done first:

• refactor: Move OTLPExporter*Base from exporter-trace-otlp-http to a new package otlp-exporter-base so that the metrics exporters do not need to depend on the trace exporters anymore.

Can be done after the refactor:

• feature/fix: Update metrics exporters to newer opentelemetry-proto version (which will also fix opentelemetry/exporter-metrics-otlp-http Does not send metrics to collector (with last collector version 0.40.0) #2675)
  • also make the metrics exporter use the otlp-transformer package to reduce duplicated code.
• feature: Update trace exporters to newer opentelemetry-proto version.
  • also make the trace exporter use the otlp-transformer package to reduce duplicated code.

[pichlermarc]

I would start working on this right away 🙂