Fixed #35581 -- Updated django.core.mail to Python's modern email API.

- Changed EmailMessage.message() to construct a "modern email API"
  email.message.EmailMessage and added policy keyword arg.
- Added support for modern MIMEPart objects in EmailMessage.attach()
  (and EmailMessage constructor, EmailMessage.attachments list).
- Updated SMTP EmailBackend to use modern email.policy.SMTP.

Deprecated:
- Attaching MIMEBase objects (replace with MIMEPart)
- BadHeaderError (modern email uses ValueError)
- SafeMIMEText, SafeMIMEMultipart (unnecessary for modern email)
- django.core.mail.forbid_multi_line_headers()
  (undocumented, but exposed via `__all__` and in wide use)
- django.core.mail.message.sanitize_address()
  (undocumented, but in wide use)

Removed without deprecation (all undocumented):
- EmailMessage.mixed_subtype
- EmailMultiAlternatives.alternative_subtype
- Support for setting (undocumented) EmailMessage.encoding property
  to a legacy email.charset.Charset object

Related changes:
- Dropped tests for incorrect RFC 2047 encoding of non-ASCII email
  address localparts. This is specifically prohibited by RFC 2047, and
  not supported by any known MTA or email client. (Python still
  mis-applies encoded-word to non-ASCII localparts, but it is a bug that
  may be fixed in the future.)
- Added tests that try to discourage using Python's legacy email APIs
  in future updates to django.core.mail.

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