Use of an experimental gRPC API in pdata

[mx-psi]

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Please be aware that this change adds as a dependency experimental gRPC APIs that are explicitly subject to change. If we were to move, remove, or change our library, your users would no longer be able to compile your library. You should not depend on our experimental APIs.

https://github.com/grpc/grpc-go/blob/master/Documentation/versioning.md

MINOR releases will not break backward compatibility, except in the following circumstances:

• An API was marked as EXPERIMENTAL upon its introduction.

If these features are essential to you, we should have a meeting and discuss a path toward stabilization or find another way you can access them via another stable API.

Originally posted by @dfawley in https://github.com/open-telemetry/opentelemetry-collector/issues/13719#issuecomment-3422727819