Add optional dependency group: stubs, containing pyshp-stubs, as an a… #132

Job	Run time
mypy-strict	11s
pre-commit	25s
build_wheel_and_sdist	17s
test_on_all_platforms (3.10, ubuntu-24.04)	32s
test_on_all_platforms (3.10, windows-latest)	44s
test_on_all_platforms (3.9, macos-latest)	1m 2s
test_on_all_platforms (3.9, ubuntu-24.04)	33s
test_on_all_platforms (3.9, windows-latest)	50s
test_on_all_platforms (3.12, macos-latest)	1m 37s
test_on_all_platforms (3.11, windows-latest)	47s
test_on_all_platforms (3.10, macos-latest)	1m 58s
test_on_all_platforms (3.13, ubuntu-24.04)	31s
test_on_all_platforms (3.11, macos-latest)	1m 44s
test_on_all_platforms (3.12, windows-latest)	1m 0s
test_on_all_platforms (3.12, ubuntu-24.04)	38s
test_on_all_platforms (3.13, macos-latest)	1m 37s
test_on_all_platforms (3.14, macos-latest)	1m 38s
test_on_all_platforms (3.11, ubuntu-24.04)	31s
test_on_all_platforms (3.15-dev, windows-latest)	1m 43s
test_on_all_platforms (3.13, windows-latest)	51s
test_on_all_platforms (3.14, windows-latest)	44s
test_on_all_platforms (3.14, ubuntu-24.04)	37s
test_on_all_platforms (3.15-dev, ubuntu-24.04)	46s
test_on_all_platforms (3.15-dev, macos-latest)	2m 24s
	23m 40s

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