Additional inputs to the avatar component

[szuperaz]

The inputs of the avatar component are too restrictive and don't allow for integrators to implement some sensible use-cases.

Solution: provide additional inputs to the avatar:

• type: channel or user
• the corresponding channel or user object
• location: channel-preview, channel-header, message-sender, message-reader, quoted-message-sender, autocomplete-item, typing-indicator, reaction

Fallback avatar for channels logic should be moved inside avatar component (https://github.com/GetStream/stream-chat-angular/pull/263/files)

[szuperaz]

🎉 This issue has been resolved in version 3.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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