Include the option to add the Sisense username in the 'sub' parameter when generating the WAT token.

When generating the WAT token, we need to pass the Sisense user ID in the 'sub' parameter. To obtain the user ID, we must repeatedly call the Sisense APIs, which can be inefficient. It would be beneficial if we could directly include the Sisense username or email in the 'sub' parameter, thereby avoiding unnecessary API calls to retrieve the Sisense user ID.

Reference Document - https://docs.sisense.com/main/SisenseLinux/using-web-access-token.htm#StructuredTokensByValue