[native] render user avatars in chat screen

Summary:
Rendered user avatars in the chat screen. Avatars only render for users who are not the viewer and at the end of a message cluster. When the message gets swiped, the avatar will move with the message.

UPDATE: First draft of diff did not consider the width of chat bubbles being affected by the new avatar component. I changed the value of some composedMessageMaxWidth instances to consider avatarOffset

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Depends on D7099

Linear Task: https://linear.app/comm/issue/ENG-3107/build-out-a-dummy-avatar-component-and-render-it-everywhere-we-will

Test Plan:
Please watch the demo videos to see all the cases I tested

multimedia message with multiple images:

video message:

Chat screen pre avatar world (when !shouldRenderAvatars)

Chat screen post avatar world (when shouldRenderAvatars)

Under the hood here are what these components look like:
Chat screen pre avatar world:

Chat screen post avatar world:

Super thin photo:
pre avatars world:

post avatars world:

Reviewers: ashoat, atul

Reviewed By: ashoat

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7067