Providing OpenTelemetry.Proto package

[mlavrent]

Currently, the OpenTelemetry protobuf definitions are provided here.

Other languages provide bindings for these protobuf models as a package in their respective packaging systems:

• Python
• Go
• Java
• Rust

This may be useful for folks wishing to write their own custom OTLP receiver or otherwise serialize/deserialize using the protobuf definitions. We could also factor the serialization/deserialization logic and protobuf files out from the OTLP exporter.

Propose to call this package OpenTelemetry.Proto, and essentially add opentelemetry-proto as a submodule, and migrate the serialization logic from the OTLP package to this.

Want to hear your thoughts on if this is worth doing - if so, I'm happy to take this on to support some things I'm looking to do with this package as a standalone (as opposed to using it as part of the OTLP exporter).

[vishweshbankwar]

@mlavrent - This is not something we are planning to add/support. For .NET the plan to implement a custom protobuf serializer.
#5730.