Add new rule to check for context=None in starttls or IMAP4_SSL

[ericwb]

Is your feature request related to a problem? Please describe.
The default behavior of the IMAP4_SSL function is to use ssl._create_unverified_context if the context parameter is None. Therefore, a proper context should always be passed.

Describe the solution you'd like
Add rule to detect IMAP4_SSL or starttls() if context is None.

Suggest fix to use ssl.create_default_context

Describe alternatives you've considered
n/a

Additional context

• https://docs.python.org/3/library/imaplib.html#imaplib.IMAP4_SSL
• https://docs.python.org/3/library/imaplib.html#imaplib.IMAP4.starttls
• https://docs.python.org/3/library/ssl.html#best-defaults
• https://github.com/python/cpython/blob/3.12/Lib/imaplib.py#L1304
• https://github.com/python/cpython/blob/3.12/Lib/imaplib.py#L819
• https://github.com/python/cpython/blob/3.12/Lib/ssl.py#L780

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