feat: unroll processor

[schmikei]

Proposed Change

Still need to write some documentation on this but the idea is to create new log entries out of arrays. The start of this is working exclusively with the body of a log entry.

Sample config

receivers:
  filelog:
    include: [ ./test.json ]
    start_at: beginning
  filelog/2:
    include: [ ./test2.json ]
    start_at: beginning
processors:
  transform:
    log_statements:
      - context: log
        statements:
          - set(body, Split(body, "\\n"))
          # - unroll(body)
  transform/split-by-comma:
    log_statements:
      - context: log
        statements:
          - set(body, Split(body, ","))
  transform/set-attr:
    log_statements:
      - context: log
        statements:
          - set(attributes["owner"], "Keith")
  unroll:
  unroll/body:
    unroll_key: ""

exporters:
  file:
    path: ./test/output.json
  debug:
    verbosity: detailed
  googlecloud/otel-agent-dev:
    log:
        compression: gzip
        default_log_name: Keiths-Macbook-Pro.local
        resource_filters:
            - regex: .*
    metric:
        compression: gzip
    project: otel-agent-dev


service:
  pipelines:
    # logs:
    #   receivers: [filelog]
    #   processors: [transform, unroll]
    #   exporters: [debug, file, googlecloud/otel-agent-dev]
    logs/2:
      receivers: [filelog/2]
      processors: [transform/split-by-comma, unroll/body, transform/set-attr]
      exporters: [debug, file, googlecloud/otel-agent-dev]

This for example can take in a log file like this

1,2,3,4,5,6,7,8

And it becomes multiple log events:

Checklist

• Changes are tested
• CI has passed

[dpaasman00]

Couple nits + what I messaged you on the side about

[dpaasman00]

Looking good!