ContactSyncService: Implement related functions

[DaVinci9196]

Includes:

1. After adding/deleting/modifying contact groups and personnel information, the cloud and device are synchronized with each other.
2. After adding/deleting/modifying contact avatar information, the cloud and device are synchronized with each other.

Note:
Tried to use PeopleApi, but did not have access to the interface.

[Sense101]

@DaVinci9196 so can people api not be made to work with MicroG? This is critical, as since a few weeks ago all requests made to the old apis return:
Received 429 status code: Contacts API has been deprecated. Migrate to People API to retain programmatic access to Google Contacts. See https://developers.google.com/people/contacts-api-migration.

This includes the google contacts sync adapter

[Sense101]

@DaVinci9196 I would like to help to finish implementing this. Please respond.

[DaVinci9196]

@DaVinci9196 I would like to help to finish implementing this. Please respond.

Sorry, I just noticed today that I used OauthToken generated based on GMS and Google Contacts app when verifying whether PeopleApi is available. Unfortunately, errors such as unable to access the API and no contacts permission appeared. You can try to see if there are other ways to solve these errors.

[Sense101]

I am looking into this