Conv zarr tiff folders

Created convert function between zarr and tiff stack

https://www.notion.so/qim-dtu/Convert-Zarr-to-tiff-folder-05d32e0b4ce549d4b69dc4fe7885a41d?pvs=4

qim3d/io/__init__.py

@@ -2,4 +2,5 @@ from .loading import DataLoader, load, ImgExamples
 from .downloader import Downloader
 from .saving import DataSaver, save 
 from .sync import Sync
+from .convert import convert
 from . import logger
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