fix: replace comma-separated fields' lists with tuples

[AlexCLeduc]

tuples have a ton of advantages, I should have used them to begin with

• Tuples are immutable. I was always worried about someone modifying the lists directly via something like append. I'm not sure how much of a footgun that was, but tuples make sure we can sidestep that issue
• lists aren't hashable which made the changelog crash (tuples are still ugly, and this will require a changelog rewrite, but at least they don't break it)

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
phac_aspc
rules.py	29	2	93%	15, 54
phac_aspc/django
comma_separated_field.py	90	23	74%	23, 36, 58–70, 77, 86–87, 97, 102, 105, 121–124, 127–128, 138–139, 147–157
excel.py	210	28	87%	18–19, 50, 82, 86, 120–122, 126–130, 133–134, 163, 171, 194, 197, 297, 300, 302, 304, 307, 313, 343–344, 351–352, 382–383
fields.py	84	16	81%	47, 68–81, 103–106, 121–126, 129–133
phac_aspc/django/admin/decorators
admin_decorators.py	18	2	89%	37–38
phac_aspc/django/helpers
jinja_dtl_interop_utils.py	7	1	86%	21
phac_aspc/django/helpers/auth
backend.py	28	28	0%	2–36
views.py	44	27	39%	22, 27–30, 35–43, 48–100
phac_aspc/django/helpers/locale
code.py	8	3	62%	10, 13–14
phac_aspc/django/helpers/logging
configure_logging.py	31	1	97%	124
json_post_handlers.py	27	3	89%	8–9, 61
utils.py	11	2	82%	43, 48
phac_aspc/django/helpers/templatetags
phac_aspc_auth.py	7	1	86%	14
phac_aspc_localization.py	11	4	64%	11, 26–29
phac_aspc/django/helpers/views
wet.py	10	6	40%	12–19
phac_aspc/django/localization
hooks.py	6	6	0%	2–16
phac_aspc/django/localization/decorators
__init__.py	2	2	0%	4–6
localization_decorators.py	11	11	0%	4–46
phac_aspc/django/settings
logging.py	27	15	44%	29–37, 47–66
security.py	21	9	57%	34–45
phac_aspc/django/settings/utils
configure_settings_for_tests.py	3	2	33%	15–19
TOTAL	914	192	79%

Tests	Skipped	Failures	Errors	Time
47	0 :zzz:	0 :x:	0 :fire:	1.876s :stopwatch: