Add a generic gRPC sink

[ryanartecona]

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Use Cases

I have a use case for using Vector to proxy Pyroscope profile payloads from an SDK client source to Pyroscope using its gRPC Push service. More details in #21057 .

Attempted Solutions

Using an http sink with a protobuf payload was attempted, but isn't enough to be received by an actual gRPC destination.

Proposal

Create a generic gRPC source which could be given a protobuf desc_file, service name, and destination address to send gRPC messages (from vector log events).

References

• #21057

Version

0.40.0