NIFI-11727 Deprecate RethinkDB Processors for Removal

[exceptionfactory]

Summary

NIFI-11727 Deprecates RethinkDB Processors for subsequent NiFi 1 releases in preparation for removal from NiFi 2 releases.

The current RethinkDB Processors depend on RethinkDB 2.3. Rethink 2.4.0 introduced notable API driver changes. These components have not been updated since initial introduction, and the implementations have memory usage issues related to buffering input and output FlowFile content. Deprecating these Processors for removal opens the potential for new versions based on the latest RethinkDB driver.

Tracking

Please complete the following tracking steps prior to pull request creation.

Issue Tracking

• Apache NiFi Jira issue created

Pull Request Tracking

• Pull Request title starts with Apache NiFi Jira issue number, such as NIFI-00000
• Pull Request commit message starts with Apache NiFi Jira issue number, as such NIFI-00000

Pull Request Formatting

• Pull Request based on current revision of the main branch
• Pull Request refers to a feature branch with one commit containing changes

Verification

Please indicate the verification steps performed prior to pull request creation.

Build

• Build completed using mvn clean install -P contrib-check
  • JDK 17

Licensing

• New dependencies are compatible with the Apache License 2.0 according to the License Policy
• New dependencies are documented in applicable LICENSE and NOTICE files

Documentation

• Documentation formatting appears as expected in rendered files

[mattyb149]

+1 LGTM, thanks! Merging to support/nifi-1.x