feat: Add AuthenticationFlowBindingOverrides to Keycloak Client

[dougkirkley]

Pull Request Template

Description

I needed the ability to use a client specific setup for browser and direct grant flows. This allows overriding those two auth flows on a client basis.

Fixes #116

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking change which improves an existing feature or documentation)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

Checklist:

• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Pull Request contains one commit. I squash my commits.

[zmotso]

/recheck

[zmotso]

@dougkirkley Thank you for contribution.
Please fix a couple of comments, and we will merge your PR.

[zmotso]

@SergK We can merge this PR.

[SergK]

@dougkirkley thank you for the contribution.
@zmotso thanks for the review