feat: add actions modules command tree

[developerkunal]

🔧 Changes

Adds the auth0 actions modules command group for managing action modules, the reusable code libraries that actions can import.

New commands:

• auth0 actions modules list — list modules, with --number, --json, --json-compact, and --csv output.
• auth0 actions modules show <id> — show a module's code, dependencies, secrets, and version details.
• auth0 actions modules create — create a module from a name and code, with optional dependencies, secrets, --api-version, and --publish. Runs guided interactive prompts when flags are omitted.
• auth0 actions modules update <id> — update code, dependencies, or secrets independently, with --publish to snapshot a new immutable version.
• auth0 actions modules delete <id>... — delete one or more modules.

Behavior notes:

• update skips the API call when nothing changed and shows the current module instead of issuing an empty write request.
• Because the API rejects deleting a module still referenced by a deployed action version (HTTP 412), such modules are hidden from the interactive delete picker, and this is called out in the command help.
• Module code is rendered as a syntax-highlighted block beneath the details table so multi-line source keeps its formatting. Secret values are never displayed, only names.
• Adds the ActionModuleAPIV3 and ActionModuleVersionAPIV3 interfaces over the go-auth0 v3 SDK, with regenerated mocks.

📚 References

🔬 Testing

• Table-driven unit tests cover the create, update, delete, and publish flows, the no-op update path, the deletable-module filtering, and the display view.
• Commander integration tests in test/integration/action-modules-test-cases.yaml exercise list, create, create-and-publish, show, update, secret preservation, publish, invalid name, and delete. Verified locally against a live tenant via commander.

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

The merge-base changed after approval.