Metadata: escape display name in email addresses

[robsdedude]

This follows the way setuptools handles email addresses from pyproject.toml files.

See here where it utilizes the std lib package email, which in turn escapes email addresses here and then here.

I noticed this bug when I tried to upload a package to PyPI with something like this in my pyproject.toml:

[project]
# ...
authors = [
    {name = "FooBar, Inc.", email = "contact@foobar.com"}
]
# ...

PyPI rejected the package:

HTTPError: 400 Bad Request from https://test.pypi.org/legacy/
'FooBar, Inc. <contact@nfoobar.com>' is an invalid value for Author-email.
Error: Use a valid email address See
https://packaging.python.org/specifications/core-metadata for more
information.

As a workaround, I changed my pyproject.toml to

[project]
# ...
authors = [
    {email = "\"FooBar, Inc.\" <contact@foobar.com>"}
]
# ...

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[messense]

Thanks! Can you also add a test case for the new function?

[robsdedude]

@messense tests added.

[messense]

LGTM, thanks!