refactor light-oauth2 service to ensure integration with light-portal

[stevehu]

The following has been changed.

1. Add copyright headers
2. Update GetHandler to filter by host instead of serviceId and return a map with services and total instead of only one array for UI pagination.
3. Update PostHandler and PutHandler to get ownerId from the JWT token and return the updated service to the caller.
4. Update openapi.yaml in test folder to adjust the get query parameter with host, change the service schema and update the scope to portal.r and portal.w

[stevehu]

refactor light-oauth2 service to ensure integration with light-portal light-oauth2 master