DICOM support with properties

[Jim O'Donnell]

I've been very excited to see the new support for DICOM that recently got
merged! I'm working on a PR that will expose some of the openslide.*
properties that we rely on, and I'm reaching out in advance.

My plan is to infer openslide.mpp-x and openslide.mpp-y from
SharedFunctionalGroupsSequence -> PixelMeasuresSequence -> PixelSpacing,
and openslide.objective-power from ObjectiveLensPower. I'll cache these at
each layer alongside the tile information and refer to the lowest layer for
setting the props.

In a separate PR I'd like to also expose openslide.associated.label and
openslide.associated.macro. It looks like that should be fairly trivial as
there's already code to identify those objects.

Any feedback on this plan would be appreciated!

Jim O'Donnell
PathAI

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