Publish automatically to PyPI

[aaron-skydio]

Use the pypa-blessed github action to publish built wheels automatically
to PyPI:
https://packaging.python.org/en/latest/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows/

Just following the instructions there, with modifications to handle our
three different packages.

This setup is much nicer in combination with automatic versioning; when
a tag is pushed (which will tell setuptools_scm that the symforce
version should be that tag), wheels are published to PyPI.

Topic: sf-auto-publish
Relative: sf-auto-version

[aaron-skydio]

Reviews in this chain:
└#418 Publish automatically to PyPI

[aaron-skydio]

#	head	base	diff	date	summary
0	8bf3a3de	7dffc872	diff	Jan 3 11:35 AM	2 files changed, 59 insertions(+), 6 deletions(-)
1	deb7a960	bce9c44a	rebase	Jan 3 12:22 PM	0 files changed
2	121ffd65	2a5d6a28	rebase	Jan 3 12:52 PM	0 files changed
3	cc13cb84	537801a5	rebase	Jan 5 21:18 PM	0 files changed
4	59c85822	3d957dbe	rebase	Jan 5 21:24 PM	0 files changed
5	0216aa99	6c93c084	rebase	Jan 5 22:19 PM	0 files changed
6	4e8de16f	96c8faac	rebase	Jan 5 22:29 PM	0 files changed
7	964a5962	96c8faac	diff	Jan 6 8:20 AM	1 file changed, 2 insertions(+), 2 deletions(-)
8	188b5042	96c8faac	diff	Jan 6 9:41 AM	1 file changed, 4 insertions(+), 4 deletions(-)
9	f5c1f46c	96c8faac	diff	Jan 6 11:49 AM	1 file changed, 1 insertion(+), 1 deletion(-)
10	5b784d64	96c8faac	diff	Jan 6 12:37 PM	1 file changed, 1 insertion(+), 1 deletion(-)
11	c5539e2a	838199e7	diff	Jan 7 21:17 PM	1 file changed, 4 insertions(+), 1 deletion(-)
12	04e31d2b	d1ced097	diff	Feb 23 20:29 PM	2 files changed, 5 insertions(+), 30 deletions(-)
13	42da475f	d1ced097	diff	Feb 23 20:30 PM	1 file changed, 3 insertions(+), 2 deletions(-)
14	bc482e76	d1ced097	diff	Feb 23 20:34 PM	1 file changed, 30 insertions(+), 29 deletions(-)
15	5f3ae206	e2edfb7d	diff	Apr 21 23:10 PM	1 file changed, 2 insertions(+), 2 deletions(-)