Add import/export functionality and buttons on ui #468

Job	Run time
ubuntu-latest, py3.9, napari repo, pip	1s
ubuntu-latest, py3.9, napari repo, conda	1s
ubuntu-latest, py3.10, napari repo, pip	3s
ubuntu-latest, py3.10, napari repo, conda	1s
ubuntu-latest, py3.11, napari repo, pip	2s
ubuntu-latest, py3.11, napari repo, conda	1s
windows-latest, py3.9, napari repo, pip	1s
windows-latest, py3.9, napari repo, conda	1s
windows-latest, py3.10, napari repo, pip	1s
windows-latest, py3.10, napari repo, conda	1s
macos-13, py3.9, napari repo, pip	1s
macos-13, py3.9, napari repo, conda	1s
macos-13, py3.10, napari repo, pip	2s
macos-13, py3.10, napari repo, conda	1s
macos-13, py3.11, napari repo, pip	1s
macos-13, py3.11, napari repo, conda	1s
deploy	1s
	21s

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