Implement RDFC-1.0

[mielvds]

This PR is a rather big one. It fully implements URDNA2015, URDNA2012 and RDFC10 and has complete test-suite coverage on these algorithms (with the exception of the one on poisonous datasets, but more about that later).

Some general remarks before I dive into the details:

• I went back and forth on how approach this: split of the canon stuff first,

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
lib/pyld
canon.py	277	49	82%	33, 43, 47–52, 66, 76–77, 500, 522, 582–587, 592–601, 605–629, 650–651
context_resolver.py	102	8	92%	70, 129, 143, 189, 195–197, 221
iri_resolver.py	141	3	98%	307–308, 318
jsonld.py	2436	176	93%	274–278, 359, 396, 401, 411, 428–443, 479–480, 522, 530, 550, 558–559, 667–672, 752–753, 768–769, 829–834, 859–860, 875–876, 886–887, 912–913, 959, 968–974, 981, 991, 1023, 1032, 1039, 1104, 1127, 1149–1151, 1161–1164, 1179, 1202, 1214–1217, 1309, 1321–1324, 1344, 1373, 1406, 1410, 1429–1430, 1447, 1490, 1508–1511, 1520, 1565, 1668–1675, 1702–1704, 1709, 1730–1733, 1909, 1930, 2358, 2367–2374, 2466, 2493, 2516, 2525, 3041, 3094, 3097, 3160, 3245, 3279, 3287, 3553, 3558, 3560, 3609, 3747–3751, 3817, 3854, 3917, 4137–4138, 4152, 4440, 4572, 4606, 4635–4638, 4664–4665, 4848, 4912, 4939, 5013, 5015, 5033, 5131, 5180, 5412, 5414, 5453, 5455, 5464, 5603, 5729, 5816, 5936–5950, 6009–6015, 6082, 6295, 6301–6305, 6344, 6347, 6437–6438, 6447
nquads.py	119	4	97%	79, 119, 243–244
util.py	58	2	97%	41, 99
lib/pyld/documentloader
aiohttp.py	65	22	66%	28–38, 69, 75, 87, 99–107, 118–121, 138, 153–155
requests.py	41	5	88%	55, 69, 81–89
TOTAL	3274	269	92%

Tests	Skipped	Failures	Errors	Time
1669	57 💤	0 ❌	0 🔥	11.235s ⏱️