feat: add client-grants organizations list command

[developerkunal]

🔧 Changes

Adds a nested organizations command under client-grants to list the organizations associated with a client grant, backed by the get-client-grant-organizations endpoint (GET /client-grants/{id}/organizations).

• New command auth0 client-grants organizations list [ls] <client-grant-id> with --number, --json, and --json-compact flags. When no id is passed, it falls back to the interactive client-grant picker.
• New ClientGrantOrganizationAPIV3 interface (with generated mock) wrapping the v3 SDK ClientGrants.Organizations client, wired into APIV3.
• New display renderer ClientGrantOrganizationList rendering an ID / Name / Display Name table, with an empty state when a grant has no organizations.
• Adds the read:organization_client_grants scope to the device-login flow so interactively logged-in users can call the endpoint.
• Includes the grant id in the client-grant picker label so grants that share an audience are distinguishable, and raises the client-grant picker page size to 100 so grants past the default first page of 50 remain selectable.

📚 References

Auth0 Management API: get-client-grant-organizations.

🔬 Testing

• Unit tests cover the list command (populated table, empty state, API error wrapping, out-of-range number) and the updated picker label assertions.
• Integration cases added for listing organizations and the invalid-number path.
• Verified end to end against a live tenant: empty grant renders the empty state, a grant with an attached organization renders the table and JSON.

📝 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)