fix: jandex plugin 1.2 brings jandex 2.4.0 causing compatibility issues

Newer Jandex versions generate indices that cannot be read by older
versions. This is causing issues, in particular, with the currently
released Quarkus version. Fabric8 5.7.1 was also bringing Jandex 2.4,
which is reverted in 5.7.2.

feat: exit the Operator if no controller is registered

feat: delay the registration of controller till the operator is started

refactor: make eventSourceDeRegisteredForResource a default method op…

…erator-framework#470

chore(deps): update fabric8 client to 5.6.0

Merge pull request operator-framework#438 from java-operator-sdk/anal…

…ytics

Add analytics to website.

chore(deps): update fabric8 client to 5.4.1

chore(docs): fix javadoc issue

chore: temporarily deactivate failing tests

chore: commit messages must use conventional commits format