Add Outbound App Management APIs with tests and documentation

[descope]

Fixes descope/etc#13474

Implementation complete. Here's a summary of what was added:

Summary

Added Outbound App Management APIs to the descope-php SDK per the enhancement request.

Files Changed:

1. src/SDK/Management/MgmtV1.php - Added 3 new endpoint paths:

   • OUTBOUND_APP_USER_TOKEN_PATH → /v1/mgmt/outbound/app/user/token
   • OUTBOUND_APP_DELETE_USER_TOKENS_PATH → /v1/mgmt/outbound/user/tokens
   • OUTBOUND_APP_DELETE_TOKEN_BY_ID_PATH → /v1/mgmt/outbound/token

2. src/SDK/Management/OutboundApps.php (new) - Management class with 3 methods:

   • fetchUserToken() - Fetch OAuth tokens for outbound apps
   • deleteUserTokens() - Delete tokens by appId/userId
   • deleteTokenById() - Delete specific token by ID

3. src/SDK/Management/Management.php - Registered OutboundApps component

4. src/tests/Management/OutboundAppsTest.php (new) - 6 unit tests covering all methods

5. README.md - Added documentation section with usage examples

API Methods:

Method	Endpoint	HTTP
fetchUserToken()	/v1/mgmt/outbound/app/user/token	POST
deleteUserTokens()	/v1/mgmt/outbound/user/tokens	DELETE
deleteTokenById()	/v1/mgmt/outbound/token	DELETE

All 6 new tests pass. No syntax errors.

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Created by Shuni 🐕

[omercnet]

@shuni review failing tests here

[shuni-bot]

🐕 Done! Updated PR: #78