NIFI-15798 Adjust Connector related properties

[kevdoran]

Summary

NIFI-15798

Before the initial release of new interfaces & properties related to Connectors in nifi-framework-api, I'd like to tweak some of the properties used for the ConnectorRepository implementation and the ConnectorConfigurationProvider extension point.

The main change here is aligning with existing property keys in nifi.properties:

• use of nifi.connector.* prefix instead of nifi.components.connectors.*; this aligns better with existing property key naming conventions
• separating nifi.connector.configuration.provider.implementation property from
  nifi.connector.configuration.provider.properties. prefix used to identify properties that are passed to the implementation. Again, this is for consistency with existing extension point patterns.

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[exceptionfactory]

Thanks @kevdoran, this change looks good, the shorter nifi.connector prefix aligns well with other types of application properties. +1 merging