Getting started with profiling and OTel collector

[florianl]

Once open-telemetry/opentelemetry-collector-releases#1098 got merged and there are artifacts of OTel collector with profiling, we should add documentation so people can get started more easily.

Documentation should include

• where to find and get artifacts of OTel collector with profiling support
• a minimal configuration of an OTel collector using profiling

As an example, the following config could be fine:

receivers:
  profiling:
    SamplesPerSecond: 19

exporters:
  debug:
    verbosity: detailed

service:
  pipelines:
    profiles:
      receivers: [ profiling ]      
      exporters: [ debug ]

https://hub.docker.com/r/otel/opentelemetry-collector-ebpf-profiler