Introduce Per Realm configuration to `PolarisAuthorizer`

### Is your feature request related to a problem? Please describe.

Today, the `PolarisAuthorizer` doesn't support realm configs. We can introduce realm specific configuration overrides, similar to the Authentication config:

https://github.com/apache/polaris/blob/main/runtime/service/src/main/java/org/apache/polaris/service/auth/AuthenticationConfiguration.java

### Describe the solution you'd like

_No response_

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

Start by reading runtime/service/src/main/java/org/apache/polaris/service/auth/AuthenticationConfiguration.java and locating the PolarisAuthorizer implementation. Compare how AuthenticationConfiguration provides realm-specific overrides, then define equivalent realm configuration behavior for PolarisAuthorizer. Done means realm-specific authorizer settings work consistently with the existing authentication configuration approach.

Written by the indexing model from the issue text.