feat: add RelativePosition instead of GridPosition #91

Job	Run time
Check Manifest	14s
test (macos-latest, 3.10) / macos-latest py3.10	24s
test (macos-latest, 3.11) / macos-latest py3.11	22s
test (macos-latest, 3.9) / macos-latest py3.9	23s
test (macos-latest, 3.12) / macos-latest py3.12	22s
test (ubuntu-latest, 3.11) / ubuntu-latest py3.11	24s
test (ubuntu-latest, 3.12) / ubuntu-latest py3.12	31s
test (ubuntu-latest, 3.8) / ubuntu-latest py3.8	25s
test (ubuntu-latest, 3.9) / ubuntu-latest py3.9	18s
test (windows-latest, 3.10) / windows-latest py3.10	51s
test (windows-latest, 3.11) / windows-latest py3.11	59s
test (windows-latest, 3.12) / windows-latest py3.12	47s
test (windows-latest, 3.9) / windows-latest py3.9	44s
test (ubuntu-latest, 3.10) / ubuntu-latest py3.10	19s
test-dependents (pymmcore-plus/napari-micromanager, pyqt5) / macos-13 py3.11	2m 42s
test-dependents (pymmcore-plus/pymmcore-plus, pyside6) / macos-13 py3.11	2m 54s
test-dependents (pymmcore-plus/pymmcore-widgets, pyqt6) / macos-13 py3.11	1m 47s
deploy	0s
upload_coverage / Upload coverage	15s
	14m 41s

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