Deep links for message IDs

[ChristophWurst]

Feature Request

Sometimes it would be nice to have deep links that work independent of the mailbox (messages can be moved) and UIDs (the server can reset them per UIDVALIDITY).

For #2214 we create calendar events. It would be nice if they could have a link to the original message. So you can look up the details if necessary.

For efficient lookup we'll most likely need #2064.

Summary

Provide a permanent deep link to messages by their unique message ID.

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