feat: Kafka FUP Phase I and Phase II

[CagriYonca]

Phase I - Changes:

• The customers are able to use configuration.yaml file to filter specific services and methods now, as specified in the technical specification.
• Specific topics and specific methods can be filtered using one of the below, configuration.yaml file has the highest priority, use send for kafka-python and produce for confluent-kafka:
  • os.environ["INSTANA_IGNORE_ENDPOINTS"] = "kafka:send,consume"
  • os.environ["INSTANA_IGNORE_ENDPOINTS"] = "kafka:produce,consume"
  • os.environ["INSTANA_IGNORE_ENDPOINTS"] = "kafka"
  • os.environ["INSTANA_IGNORE_ENDPOINTS_PATH"] = "configuration.yaml"

Phase II - Changes:

• If the customer ignores an endpoint or method in kafka, this ignored span will add a suppression header into the outgoing message and the spans reading these messages will be automatically ignored as well. This enables us to support downstream suppression.

[pvital]

@CagriYonca, please work on the #721 first, and after it is merged, we can finalize this one and the following one.

[pvital]

Few requests.
I am missing some tests for the new functions or environment variables to be parsed, as the INSTANA_IGNORE_ENDPOINTS_PATH.

[pvital]

It looks good to me.

Only two missing copyright headers and then you can merge it.