open_mfzarr files + intake-xarray

[Mikejmnez]

This is related to a previous issue (#3668), although the actual problem on that issue is a bit more technically involved and is related with clusters... I decided to open this related issue so that the discussion in #3668 remains visible for other users.

This issue is about the need to implement code that allows to read multiple zarr files. This can be particularly helpful when reading data through an Intake Catalog entry (Intake-xarray plugin), which can allow for a compact way to introduce parallelism when working with multiple zarr files. There are two steps for this, one to work at the xarray level (write a fuction that does that) and then write an option on the Intake-xarray plugin that can use such xarray functionality.

I am more than willing to work on such problem, if nobody's already working on this.

[stale]

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