Adding typing to library

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
modio
init.py	5	0	100%
client.py	214	8	96%	64–65, 69–70, 195, 273, 277, 281
entities.py	204	10	95%	450–452, 625–630, 707
enums.py	87	0	100%
errors.py	10	0	100%
game.py	170	8	95%	429, 445–447, 461, 477–479
mixins.py	35	0	100%
mod.py	287	10	97%	132–135, 849, 870, 921–926, 958, 965
objects.py	146	1	99%	160
utils.py	57	12	79%	14, 26, 31–32, 80–86, 146, 148
TOTAL	1215	49	96%