Feat: Add train test split

[KennethEnevoldsen]

Coverage Report

File	Stmts	Miss	Cover	Missing
src/snip
init.py	1	0	100%
main.py	3	3	0%	1–4
train.py	0	0	100%
src/snip/cli
init.py	1	0	100%
_util.py	13	5	62%	13, 18–22
convert.py	29	5	83%	50–55, 85
src/snip/data
init.py	1	0	100%
dataloaders.py	124	9	93%	78, 144, 169, 172, 176, 239, 246, 257–258
src/snip/models
init.py	4	0	100%
create.py	27	4	85%	31, 44, 48, 56
denoising_autoencoder.py	29	14	52%	24, 32–44, 47–53
pl_wrapper.py	105	67	36%	53, 57, 70–82, 85–93, 96–115, 118–154, 157–162, 165, 168, 172–191
snpnet.py	213	8	96%	43, 239, 388–392, 433
TOTAL	550	115	79%