Add otel trace instrumentation on gRPC calls

[Fricounet]

Is your feature request related to a problem? Please describe.
Add some more observability to the csi driver. In particular, add gRPC tracing using opentelemetry.

Describe the solution you'd like in detail
We implemented it in our fork. So I can submit the same PR here.

Describe alternatives you've considered
None

Additional context
Add any other context or screenshots about the feature request here.

[ConnorJC3]

Hi @Fricounet - we discussed this and we'd definitely be open to accepting a PR for otel tracing. It will have to go through the normal PR review process, and DataDog will have to sign the standard CLA assigning the copyright to the Kubernetes project. Feel free to open a PR and we'll take a look!