Update slf4j and openfeign to fix security vulnerabilities

Updating:
slf4j 1.7.25 -> slf-reload4j 1.7.36
openfeign 10.1.0 -> 11.10

Updated Authorisation to TPP platform to use tokens API

Updated Authorisation client to TPP platform to use new API for token auth

Ensured compatibility with Venafi TPP 20.4

• Updated logging
• Defined a docker-compose.yml to run the Connector in a containerised environment
• Added Integration Test

Minor Cosmetic changes

We've made some changes to bring the connector more in line with Venafi Branding.
N.B. the default Topic is now VENAFI-LOGS

Updating the Venafi Connector

Bugfix:

• Fixed issue around incorrect storage of Source Offsets

Create release for Confluent Integration Verification

This version of the connector is being submitted to confluent for verification to become a verified integration.

Updates for the Venafi Trust Protection Platform source Connector

Added extra unit testing
Improved the readme in preparation for verification process
Added minor tweaks around versioning & logging.
Improved overall code coverage.

Introducing the Venafi Trust Protection Platform source Connector

Merge pull request #7 from opencredo/config_def_test_and_validate

Added unit tests around config and other minor tweaks.