Add a managementState field to the Collector CRD to disable the reconciliation

[iblancasa]

The idea of this task is to add a new field in the CRD called managementState. It would be placed under .spec.managementState for the OpenTelemetry Collector instances.

Possible values:

• Managed (default value): the reconciliation works currently does
• Unmanaged: disables the reconciliation

Disabling the reconciliation can be useful in different use cases:

• Debugging
• Edit the objects created by the operator without losing the changes (because of the reconciliation)
• Keep instances without upgrading (if, for whatever reason we need to upgrade the operator and all the instances except some of them)

This feature is something we implemented for the Tempo Operator and it is also implemented in the Loki Operator.

[avadhut123pisal]

I can work on this, if it is not already in progress.