Write Support

[Artur-man]

Replica of #163. We will continue as a draft until reconstructing the original PR.

Introducing methods to write/update zarr stores, groups, atttibutes and SpatialElements:

• create in-memory metadata

Ver.	image	label	shape	point	table
v3	✔	✔	✔	✔	❌

• create in-memory SpatialElements

Ver.	image	label	shape	point	table
v3	✔	✔	✔	✔	❌

• write metadata to json

Ver.	image	label	shape	point	table
v3	✔	✔	✔	✔	❌

• write SpatialElements to zarr store
  https://spatialdata.scverse.org/en/latest/api/SpatialData.html#spatialdata.SpatialData.write_element

Ver.	image	label	shape	point	table
v3	✔	✔	✔	✔	❌

• write SpatialData itself https://spatialdata.scverse.org/en/latest/api/SpatialData.html#spatialdata.SpatialData.write

• test on other example datasets from https://spatialdata.scverse.org/en/latest/tutorials/notebooks/datasets/README.html

• add to vignette and examples

[HelenaLC]

Artür, would it be possible to somehow divide this into smaller, well tested and documented PRs? This looks like a lot for one PR 🥹 Smaller PRs will also help not running into another huge divergence as things progress before it's all all done.

[Artur-man]

Let me think about it ... most of these changes do not make much sense without other components.

[Artur-man]

Artür, would it be possible to somehow divide this into smaller, well tested and documented PRs?

I think the tests and docs are fine, but we can remove the formatting utilities and write the elements as zarr v3 and sd 0.2 versions to make it simpler for now.