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* Add the serialized `Postable` to EML converter code for group mailboxes and associated tests.
* We should converge this with `Messageable` code at some point with a small translator function which converts `Postable` to `Messageable`. Reason being that posts are a subset of messages. Although I feel it's a bit premature right now. Once we have tested this in prod a bit, and we know for a fact that posts are indeed a true subset of messages, we can do this convergence.
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The upstream library we are currently using errors out if we try to attach an empty file. This PR skips trying to attach empty files.
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Uses a fork of the upstream library to create eml files
e8c58c45d8
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Add logic to convert from msg(backup available in corso) to eml
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