enable coverage of the multiprocess code

[sroet]

This is everything that is required to enable correct multiprocess tracking for the coverage 😄
Also adds all the .coverage stuff to gitignore

[github-actions]

File	Coverage		Missing
All files	78%	✅
src/pytom_tm/__init__.py	66%	❌	6-7
src/pytom_tm/angles.py	94%	✅	44
src/pytom_tm/correlation.py	85%	✅	94-95 126
src/pytom_tm/entry_points.py	68%	❌	27 104-121 283-342 431-445 542-557 791-858 899-910
src/pytom_tm/extract.py	71%	❌	25-26 108-119 171-177 203-206 278-296
src/pytom_tm/io.py	42%	❌	14-18 24-27 33-36 42-45 51-54 61-65 73-86 92-99 106-113 128-130 163 197-198 243-245 261 277 294-303 323-328
src/pytom_tm/mask.py	80%	✅	70 85 94-95
src/pytom_tm/matching.py	95%	✅	186-196 340
src/pytom_tm/parallel.py	84%	✅	14-15 81-87 95-97 104 109 148
src/pytom_tm/plotting.py	15%	❌	9 20-22 25-32 36-44 48-51 54-70 73-74 77-78 98-103 119-127 133-150 165-173 177-194 198-206 210-217 223 229 234 248-398
src/pytom_tm/template.py	53%	❌	15-16 57-58 67 76-87 92-97 107-112 114
src/pytom_tm/tmjob.py	96%	✅	169-170 182 188-190 193 326 366
src/pytom_tm/utils.py	78%	✅	16-18
src/pytom_tm/weights.py	95%	✅	59 290-291 298 477 480 483
tests/test00_parallel.py	96%	✅	81 93
tests/test_angles.py	95%	✅	34
tests/test_entry_points.py	90%	✅	18-19
tests/test_extract.py	91%	✅	16
tests/test_mask.py	97%	✅	96
tests/test_template_matching.py	96%	✅	48
tests/test_tmjob.py	98%	✅	144 353
tests/test_weights.py	96%	✅	117 294 308 320

Minimum allowed coverage is 75%

Generated by 🐒 cobertura-action against fdb7432

[McHaillet]

LGTM