[PublicAsset][Dev] Create data handler backbone with PublicAsset methods

[tddang-linagora]

Description

This data handler will connect "PublicAsset/get" and "PublicAsset/set" methods from the back-end to Flutter client, in order to further implement public link image in Twake Mail signature.

API/DataSource/Repository abstraction

// PublicAsset/get
Future<List<PublicAsset>> getPublicAssetFromIds(List<Id> publicAssetIds);

// PublicAsset/set destroy
Future<void> deletePublicAssets(List<Id> publicAssetIds);

// PublicAsset/set create
Future<void> createPublicAssets(Map<BlobId, List<IdentityId>> blobWithIdentityIds);

// PublicAsset/set update
enum PublicAssetUpdateAction {add, remove}
Future<void> updatePublicAssets(Map<Id, Map<IdentityId, PublicAssetUpdateAction>> publicAssetToUpdate);

DoD

• [x] Implement "PublicAsset/get" and "PublicAsset/set" methods and write unit tests: https://github.com/linagora/jmap-dart-client/pull/91
• [x] Create API, data source & repository classes, and write unit tests: https://github.com/linagora/tmail-flutter/pull/3062
• [ ] ~Create GetPublicAssetInteractor and write unit tests~

[hoangdat]

• [x] Describe abstraction of PublicAssetRepository

[hoangdat]

• [ ] dont touch to old logic of identity