Deleting cassandra implementation

[rolnico]

Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem?

No

What kind of change does this PR introduce?

Feature

What is the current behavior?

A cassandra implemetnation of AFS is present but since cassandra is stuck on Java 11, it is impossible for now to update AFS to Java 17

What is the new behavior (if this is a feature change)? There is no more cassandra dependency so AFS can be updated

Does this PR introduce a breaking change or deprecate an API?

• [x] Yes
• [ ] No

If yes, please check if the following requirements are fulfilled

• [x] The Breaking Change or Deprecated label has been added
• [ ] The migration steps are described in the following section

What changes might users need to make in their application due to this PR? (migration steps)

If you were using the default cassandra implementation, you have now to implement your own AFS implementation. Note: a new default implementation will come during the year.

Other information:

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
78.3% Coverage on New Code (required ≥ 80%)
E Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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