feat: Add OP normalizer

[igorsimko]

This PR adds support for Ophthalmic Photography 8 Bit Image modality. Often time referenced by OCT (#402)

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[igorsimko]

@pieper I went over OP normalizer again and I don't fully understand whether it's needed or not. Problem in this bug report refers to only OCT scan when trying to export segmentation for it. I haven't encountered segmentations for OP modality yet. Segmentations are usually only visualized on OP from OCT.

See following example where A is OCT and B is OP

OP file I attached (from realt device) doesn't have bunch of dicom tags which are used in normalizer.js so I would have to just use simple

class OPImageNormalizer extends Normalizer {
    normalize() {
        this.dataset = this.datasets[0];
    }
}

Do you think we should still add OP to normalizers in that case?

[pieper]

I'm not familiar enough with OCT and OP to know for sure, but as a general design pattern for dcmjs it's good to have normalizers for any sop class so that code can rely on them providing a fixed up version of any non-standard dicom (e.g. fix up any vendor screwups). Many sop class normalizers can be basically no-ops, which is good.

[igorsimko]

Thank you for you feedback. In that case I updated PR to also include test and run simple normalization as written in comment above.