Support custom exporting directly with pdata structures

[MrAlias]

Currently the controller converts telemetry data into OTel data using the go.opentelemetry.io/otel/sdk/trace package. This is inefficient given we transport this data as ptrace.Traces and rigid (it does not allow user customization).

Instead, we should allow customization of the data handling. The Instrumentation type can accept implementations of a Handler interface that is designed to handle telemetry data.

This should include useful default handlers. We should provide ways for users to easily export directly with pdata (i.e. a collector).

Proof of concept

[MrAlias]

cc @RonFed