OpAMP Controller extension: support mTLS

[albertlockett]

Pre-filing checklist

• I searched existing issues and didn't find a duplicate

Component(s)

Rust OTAP dataflow (rust/otap-dataflow/)

Is your feature request related to a problem?

No response

Proposed Solution

Have the OpAMP controller extension support connecting to server using mTLS.

This should use the same configuration options that are used for other gRPC clients (e.g. such as those used by the OTLP gRPC exporter).

Alternatives Considered

No response

Additional Context

No response

[albertlockett]

working on it this week