Handle phase + mag for func better

[yarikoptic]

Might be a matter for heuristic (e.g. reproin) but for BIC we have a case where it is func data with mag and phase separately:

and following the https://bids-specification.readthedocs.io/en/stable/modality-specific-files/magnetic-resonance-imaging-data.html#task-including-resting-state-imaging-data both should be _bold but with _part-{mag,phase} but heudiconv (1.3.4) with reproin heuristic with -c none got

 ('{bids_subject_session_dir}/func/{bids_subject_session_prefix}_task-cross_bold', ('nii.gz', 'dicom'), None): ['13-func-cross_acq-ep2d_MJC_19mm'],                                                                            
 ('{bids_subject_session_dir}/func/{bids_subject_session_prefix}_task-cross_phase', ('nii.gz', 'dicom'), None): ['14-func-cross_acq-ep2d_MJC_19mm'], 

so might be a thing to fix for reproin actually