Feat/fixes for label studio conversion

[redur]

Some fixes that are required to perform the conversion from LabelStudio annotations to ground truth.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
src/stratigraphy
__init__.py	8	1	88%	11
extract.py	188	188	0%	3–482
get_files.py	21	21	0%	3–48
line_detection.py	26	26	0%	3–76
main.py	94	94	0%	3–237
src/stratigraphy/util
coordinate_extraction.py	121	19	84%	29, 49, 53, 57, 61–69, 90, 186, 284, 288, 300–303
dataclasses.py	32	3	91%	37–39
depthcolumn.py	208	67	68%	26, 30, 51, 57, 60–61, 85, 88, 95, 102, 110–111, 121, 138–154, 199, 238, 254–262, 274, 279, 286, 313, 323, 352, 373, 376–387, 402–403, 448–490
depthcolumnentry.py	26	7	73%	12, 15, 29–30, 33, 45, 52
description_block_splitter.py	70	2	97%	24, 139
draw.py	74	74	0%	3–226
duplicate_detection.py	51	51	0%	3–146
extract_text.py	27	2	93%	38–39
find_depth_columns.py	89	6	93%	41–42, 70, 82, 175–176
find_description.py	63	28	56%	27–35, 50–63, 79–95, 172–175
geometric_line_utilities.py	86	2	98%	82, 132
interval.py	106	55	48%	24–27, 31–34, 39, 44, 47, 57–59, 99–145, 166, 171–187
language_detection.py	18	18	0%	3–45
layer_identifier_column.py	91	91	0%	3–227
line.py	49	4	92%	25, 42, 51, 98
linesquadtree.py	46	1	98%	76
plot_utils.py	43	43	0%	3–120
predictions.py	187	187	0%	3–387
textblock.py	74	8	89%	27, 51, 63, 75, 98, 119, 127, 155
util.py	40	18	55%	22, 40–47, 61–63, 87–88, 100–105
TOTAL	1838	1016	45%

Tests	Skipped	Failures	Errors	Time
58	0 💤	0 ❌	0 🔥	1.099s ⏱️

[stijnvermeeren-swisstopo]

I did not test it with label studio, but everything looks reasonable.