Add port for Adobe DNG SDK 1.7.1

[François-Xavier Thomas (fxthomas)]

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This is a draft port for Adobe DNG SDK in hopes that it is useful to someone. This is an adaptation of CitrusPeel's CMake build files to work with vcpkg.

I checked that it works for my purposes, but there are a few issues that need fixing before this is merged (besides the checklist above) so I do not think this is fully ready.

Notably, a few that come to mind:

• There are vendored dependencies (zuid, the Adobe XMP SDK which has another port PR)
• Adobe does not really define public/private headers so I included all of them. I am not sure if this is the right way to do it ?
• The build of the dng_validate executable should technically be done using a different set of defines than the ones used to build the library, but I'm not sure how to handle that in vcpkg ?
• The license is a custom license text from Adobe, I'm not sure what SPDX identifier to use for that ?

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