MySQL integration credentials support

[amitlicht]

Description

• Implement MySQL support for generating user passwords
• Eliminate intents reconciler for credentials operator, used to detect when a database user should be created. Instead, the intents operator will handle passwordless user creation and annotate the pods with the details of the created user, leaving the credentials operator responsible only for generating passwords, configuring them on the DB, and storing them as secrets.

References

Intents-operator PR: https://github.com/otterize/intents-operator/pull/423

Testing

• [x] This change adds test coverage for new/changed/fixed functionality

Checklist

• [x] I have added documentation for new/changed functionality in this PR and in github.com/otterize/docs