Fetch messages with hard coded thread id

[thomtrp]

Calling backend to fetch messages:

• retrieve thread id from state
• adding a findManyRecords query in right drawer email container
• adding new object record types based on the backend response
• adapt props based on these types

Remaining work:

• call backend to retrieve threads. This is the last part mocked
• see if we need to store the viewable thread in state or if we can use apollo cache
• add pagination + infinite scroll for both threads and thread messages
• display recipients in design + do a pass on design in general

[Weiko]

LGTM, left a comment to address before merging!

[Weiko]

Question: Do we handle auto-generated avatar using the displayName if avatarUrl is absent in EmailThreadMessageSender?

[thomtrp]

Yes! An empty string (which is the default value) will generate an avatar with the first letter of the display name