v1.2.0: add dask suppport and valis alignment (#69)

Library release HEST v1.1.0:

• add dask support for loading larger than RAM transcript dataframes with XeniumReader
• refactor alignment methods (decouple alignment matrix loading from alignment)
• add Valis registration support to the processinig pipeline
• cleanup unused functions/imports
• hestcore 1.0.3 -> 1.0.4 (better documentation)

v1.1.0

Library release HEST v1.1.0

• Speed up import of hest lib (5X) by removing dependencies and using conditional imports
• Speed up deep learning based tissue segmentation by 10X
• Easy CellViT segmentation with cellvit-light
• Refactor tissue segmentation saving, now saving as .geojson
• Now possible to load cellvit segmentation as .parquet (10X speedup)
• Improve support for SpatialData (attaching cell segmentation)