chore: Upgrade stackable-operator to 0.110.0

[dervoeti]

Description

Part of stackabletech/issues#844

Upgraded stackable-operator from 0.108.0 to 0.110.0 and snafu from 0.8 to 0.9.

Replaced the untyped HashMap<String, HashMap<String, String>> config overrides with a new DruidConfigOverrides struct that supports runtime.properties, jvm.config and security.properties via KeyValueConfigOverrides.

Also configures the druid.auth.pac4j.oidc.clientAuthenticationMethod property using the new ClientAuthenticationMethod enum from operator-rs, fixing the OIDC integration test that requires explicit client auth method (client_secret_post for Keycloak) and making it possible for users to specify this method in general.

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

Author

• Changes are OpenShift compatible
• CRD changes approved
• CRD documentation for all fields, following the style guide.
• Helm chart can be installed and deployed operator works
• Integration tests passed (for non trivial changes)
• Changes need to be "offline" compatible
• Links to generated (nightly) docs added
• Release note snippet added

Reviewer

• Code contains useful comments
• Code contains useful logging statements
• (Integration-)Test cases added
• Documentation added or updated. Follows the style guide.
• Changelog updated
• Cargo.toml only contains references to git tags (not specific commits or branches)

Acceptance

• Feature Tracker has been updated
• Proper release label has been added
• Links to generated (nightly) docs added
• Release note snippet added
• Add type/deprecation label & add to the deprecation schedule
• Add type/experimental label & add to the experimental features tracker

[razvan]

It works but I think a small update of the docs is in order because the client authentication method is not mentioned anywhere user visible.
Also the oidc test is fixed implicitly by virtue of the default value in code so the new field is also not visible in the tests.