Init POC opamp

[nchaulet]

Description

Poc to figure and explore how OpAmp work

Testing with the following otelcol config

extensions:
  opamp:
    instance_uid: 01921fdd-3a15-7b37-9a41-587b4b7901c2
    capabilities:
      reports_effective_config: true
    server:
      http:
        endpoint: http://127.0.0.1:8220/opamp
        polling_interval: 1s
        tls:
          insecure_skip_verify: true

receivers:
  filelog:
    start_at: beginning
    include:
      - ${env:OTEL_WORKSHOP_DIR}/scenarios/simple-logs.log
exporters:
  debug:
    verbosity: detailed

service:
  telemetry:
    metrics:
      level: none
  extensions: [opamp]
  pipelines:
    logs:
      exporters:
        - debug
      receivers:
        - filelog

With otelcol-contrib

[nchaulet]

@michel-laterman looks like this will be the way to extends the server

[mergify]

This pull request does not have a backport label. Could you fix it @nchaulet? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-./d./d is the label to automatically backport to the 8./d branch. /d is the digit

[mergify]

backport-8.x has been added to help with the transition to the new branch 8.x.
If you don't need it please use backport-skip label and remove the backport-8.x label.