Add right granularity in schemas management

### Search before reporting

- [x] I searched in the [issues](https://github.com/apache/pulsar/issues) and found nothing similar.

### Motivation

To support custom right management for schemas, we need to introduce check rights for schema operations.

### Solution

_No response_

### Alternatives

_No response_

### Anything else?

_No response_

### Are you willing to submit a PR?

- [x] I'm willing to submit a PR!

The issue names no files, tests, or entry points. Start by locating the schema-management authorization code and existing rights checks; done means the required permissions for schema operations are defined and covered by tests.

Written by the indexing model from the issue text.