Create GitHub Action to test running of nii2dcm

[tomaroberts]

• [x] create build_and_test_cli.yml

• Build tests and upload test data for the following:

  • [ ] Dicom class
  • [ ] DicomMRI class
  • [x] DicomMRISVR class

• Need to make DicomCT class, etc. and make tests. Can pull public MRI/CT data.

[tomaroberts]

Partially resolved by #22