Improving Avatar API's

[MrRefactoring]

As we approach the release of version 3.0.0, several endpoints within the Avatar API need improvements. Here's a list of the endpoints and their corresponding tasks:

• [x] storeAvatar: Add the avatar to the request body. This entails:

1. Updating the parameter model
2. Configuring to include the 'body' property

• [x] getAvatarImageByType:

1. The return type needs to be updated to Models.AvatarWithDetails.
2. The endpoint should be adapted to deliver a response based on the new model.
3. The responseType should be changed to arraybuffer. For reference on these changes, please consult this development PR.

• [x] getAvatarImageByOwner:

1. The return type needs to be updated to Models.AvatarWithDetails.
2. The endpoint should be adapted to deliver a response based on the new model.
3. The responseType should be changed to arraybuffer. For reference on these changes, please consult this development PR.

• [x] Avatar model: Need to specify and clarify which properties within this model are mandatory.

Please make changes for both versions of API (Version2 and Version3)

[MrRefactoring]

Please create PR's to v3.0.0 branch