Well this was more complex that it should have been. And not very
optimized because we're not using pipelining in the submit() path:
1. first upload email bytes as a Blob object. This requires a standalone
API post call at a specific url so it cannot be changed with followup
calls to reference the blob's id.
2. Create an EmailObject in the drafts folder.
3. Create an EmailSubmission object referencing the email id of prevous
call. Unfortunately I cannot get the Result Reference to work in
stalwart jmap, so for now this is too a separate transaction.
Caveat emptor: Errors might not be returned to the user.
Closes#277.
https://git.meli.delivery/meli/meli/issues/277https://git.meli.delivery/meli/meli/pulls/279
Signed-off-by: Manos Pitsidianakis <manos@pitsidianak.is>
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