feat: implement new cve-specific rfc5322 parser #186
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Python 3.12 changed the email.parser parsing as part of python/cpython#124452, but this broke our parser. We were using email.parser as a cheap way to parse RFC5322, but we're already had to do post-processing for our format and would need to add compatibility for the new parsing. Instead, implement our own RFC5322 parser and tailor it to our needs (which allows better formatting checks).
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Python 3.12 changed the email.parser parsing as part of python/cpython#124452, but this broke our parser. We were using email.parser as a cheap way to parse RFC5322, but we're already had to do post-processing for our format and would need to add compatibility for the new parsing.
Instead, implement our own RFC5322 parser and tailor it to our needs (which allows better formatting checks).