Add option to load either processed or unprocessed from Oxford Instrument's H5OINA file

[hakonanes]

So about importing .h5oina data in Kikuchipy, it seems that the Dataname 'Processed Patterns' is still valid. But once there are also Unprocessed Patterns stored in the h5, it seems to me that the Kikuchipy reader starts to load these into memory, even when Lazy=True. Does the reader by default import all other data into memory, accept for the 'Processed Patterns', when Lazy=True?

Sorry for the spam, but I solved this issue, at least temporarily. I found the line that specifies that the pattern dataset should not be read into memory (I think), and added "Unprocessed Patterns" to it. I changed line 99 in oxford_h5ebsd.py to the following:
dd = _hdf5group2dict(group["EBSD/Data"], data_dset_names=[self.patterns_name, "Unprocessed Patterns"])
This solves the issue for me.
Perhaps this is not a suitable permanent solution though. I guess the user would need to have the option to import unprocessed patterns, if they like, instead of processed patterns...

Originally posted by @Tijmenvermeij in #690 (comment)

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I did not think about H5OINA files storing both processed and unprocessed patterns when writing the reader. Thank you for spotting the bug, @Tijmenvermeij!

The solution is, as you say, to give the user the opportunity to load either of them (or both, if they load consecutively). The other, if present, should not be read into memory.

We should look at releasing a v0.11.0 within the next couple weeks with these changes.

[Tijmenvermeij]

For loading "Unprocessed Patterns" from .h5oina files, it probably also makes sense that the static BG is also loaded from the file. I'm not sure if this is currently done already...

[hakonanes]

The static background is loaded

kikuchipy/src/kikuchipy/io/plugins/oxford_h5ebsd.py

Lines 140 to 141 in a016c0a

	# --- Static background
	scan_dict["static_background"] = hd.get("Processed Static Background")

and available in the property EBSD.static_background. This is also mentioned in the IO user guide.