feat: add authz schema definition files

[rodmgwgu]

Problem

The schema loading pipeline needs the actual authorization schema definitions (course and library roles/permissions) available in the package before the loader can consume them.

Approach

Adds the schema YAML files under openedx_authz/authz/:

• course_roles.authz.yaml, course_permissions.authz.yaml
• library_roles.authz.yaml, library_permissions.authz.yaml
• package __init__.py

Rollback plan

Additive-only (new files under a new package dir). Revert the commit to remove them; nothing else references these files until PR 3 lands.

AI Usage

Kiro was used to translate the existing roles and permissions, using the existing descriptions in the frontend code over the policy definition as source of truth, with human guidance and validation.

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Stack (2/3):

1. docs: add ADR for authorization schema source tracking #444 — ADR doc
2. This PR — authz schema YAML files (base: rod/authz-schema-adr)
3. rod/authz-schema-loader — schema loading pipeline (base: this branch)

Base is the PR 1 branch; review only the incremental diff. Merge after #444.

Merge checklist:

• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets — depends on docs: add ADR for authorization schema source tracking #444

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