Feature request: IMAP support

[jakajancar]

We make a mail client. It would be cool if mailcrab also supported IMAP.

[marlonbaeten]

IMAP is not really within the use-cases that MailCrab was intended for. I can imagine that providing IMAP support would also introduce the complexity of folders etc.

However - I would be open for any ideas that would allow adding IMAP support without adding too much complexity to the code base. Maybe you have some suggestions for crates I could look at?