feat: support additional processor injection from values

[imZack]

Description: <Describe what has changed.>

Currently, there is no easy way to add more processors in the pipeline. With this PR, it can be done by injecting the values.

For instance, I want to exclude some namespaces, I can inject values like the below to make it work.

adotCollector:
    processors:
      timeout: 60s
      additionalProcessors: |
        filter/no-kube:
          metrics:
            exclude:
              match_type: regexp
              resource_attributes:
                - Key: Namespace
                  Value: (kube-*)
    service:
      metrics:
        receivers: ["prometheus"]
        processors: ["batch/metrics", "filter/no-kube"]
        exporters: ["prometheusremotewrite"]

Link to tracking Issue: <Issue number if applicable>

Testing: <Describe what testing was performed and which tests were added.>

Documentation: <Describe the documentation added.>

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[imZack]

Can someone help to review this PR?

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity.

[crigertg]

It would be nice if this merge request is reviewed and merged. This is an important feature which should be supported.

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity.

[sukrit007]

Bump (to remove stale action)

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity.

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity.