Allow more than one other dim in KTrajectory

[fzimmermann89]

Just relaxes one of the checks: KTrajectory can now be created from tensors with more than 4 dimensions

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
src/mrpro/algorithms
_remove_readout_os.py	30	2	93%	46, 48
src/mrpro/data
_AccelerationFactor.py	13	13	0%	15–36
_AcqInfo.py	64	1	98%	93
_Data.py	15	2	87%	58, 73
_DcfData.py	78	3	96%	71, 97, 178
_IData.py	57	7	88%	44, 49, 109, 114, 122, 128, 132
_IHeader.py	58	2	97%	86, 113
_KData.py	108	12	89%	83–84, 166, 168, 198, 203–204, 248, 250, 254, 284, 300
_KHeader.py	125	9	93%	34, 81, 119, 170, 181, 188–189, 192, 199
_KNoise.py	21	9	57%	48–61
_KTrajectory.py	39	2	95%	142, 162
_SpatialDimension.py	39	5	87%	74, 77, 84–86
_TrajectoryDescription.py	14	1	93%	35
src/mrpro/data/traj_calculators
_KTrajectoryCalculator.py	26	3	88%	37, 63, 65
_KTrajectoryIsmrmrd.py	15	2	87%	55, 62
_KTrajectoryPulseq.py	33	1	97%	72
src/mrpro/operators
_FourierOp.py	112	6	95%	43–50, 205, 255
_LinearOperator.py	20	2	90%	46, 51
_ZeroPadOp.py	15	1	93%	45
src/mrpro/utils
_rgetattr.py	3	1	67%	20
_zero_pad_or_crop.py	30	6	80%	37, 41, 64, 67, 70, 73
TOTAL	1492	90	94%

Tests	Skipped	Failures	Errors	Time
110	0 💤	0 ❌	0 🔥	36.439s ⏱️

[schuenke]

Maybe we should include the refactoring of the rest of the code (as mentioned in #138) in this PR? It's adjusted in many functions already, but I think we didn't adjust all code yet.

[fzimmermann89]

I am pretty sure there are lots of functions left that could use a fix - - but this particular one I need right know and would like to get merged ASAP..