otlp: Mimir's OTLP endpoint to return marshalled proto bytes as response body about mimir HOT 2 CLOSED

As our recommended OTel ingestion architecture relies on the batching of the metrics, spans, and logs with the OpenTelemetry Collector Batch Processor (default send_batch_size=8912) and then are exported with the OTel Collector OTLP HTTP Exporter, shall we verify the error message is human readable through the OpenTelemetry Collector logs?

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@ying-jeanne and I are picking this up :) @jesusvazquez and I are leaning towards writing a new distributor.handler function specifically for the OTLP endpoint, since it will probably lend itself to easier maintenance than sharing handler with the normal remote write endpoint.

This OTLP specific handler should respond with Status protobuf messages for error cases.

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