Major Description
The idea is to allow fastly retrieve preview of a mail with attachment metadata with JMAP.
e.g:
Nowadays with Email/get, to fetch the `attachments` property, we use the FULL_CONTENT fetch type means fetching the body content while we don't need that in this case.
We should introduce a JMAP read level that retrieves the `attachments` property without fetching the body of the mail.
Attachments
Issue Links
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