resample(_cube)_spatial: metadata transform in dry run

[jdries]

dry run requires accurate info on cube metadata (crs, resolution, extent) to make decisions on global extent and other load parameters (resolution, target crs)

currently, this is inaccurate because if a target cube has been resampled, dry run will not 'see' this, can lead to bugs so quite important

[soxofaan]

resample_spatial (and resample_cube_spatial) arguments are already being tracked during dry run:

openeo-python-driver/openeo_driver/dry_run.py

Lines 710 to 720 in b5f0388

	def resample_spatial(
	self,
	resolution: Union[float, Tuple[float, float]],
	projection: Union[int, str] = None,
	method: str = "near",
	align: str = "upper-left",
	):
	return self._process(
	"resample_spatial",
	arguments={"resolution": resolution, "projection": projection, "method": method, "align": align}
	)

They are being included in source constraints:

openeo-python-driver/openeo_driver/dry_run.py

Lines 392 to 399 in b5f0388

	args = resampling_op.get_arguments_by_operation("resample_spatial")
	if args:
	resolution = args[0]["resolution"]
	if not isinstance(resolution,list):
	resolution = [resolution,resolution]
	projection = args[0]["projection"]
	method = args[0].get("method","near")
	constraints["resample"] = {"target_crs": projection, "resolution": resolution, "method": method}

extracted to LoadParameters():

openeo-python-driver/openeo_driver/ProcessGraphDeserializer.py

Lines 716 to 718 in b5f0388

	params.target_crs = constraints.get("resample", {}).get("target_crs",None)
	params.target_resolution = constraints.get("resample", {}).get("resolution", None)
	params.resample_method = constraints.get("resample", {}).get("method", "near")

and used in load_collection from geopyspark driver:
https://github.com/Open-EO/openeo-geopyspark-driver/blob/f5a1532634336f72dd56b9e44e4c75365ad2ec2b/openeogeotrellis/layercatalog.py#L238-L251

So I'm not sure it's actually necessary to add something new, or an existing (broken?) feature just has to be fixed

[soxofaan]

Just finished/merged Open-EO/openeo-python-client#690 with Open-EO/openeo-python-client#712
which hopefully automatically improves the situation in the python driver.
I'll set up a unit test to verify

[soxofaan]

improved resample resolution/projection handling in dry run with 7116e40

(added a test about resample_cube_spatial that gets resolution from other resample_spatialed cube)