Compile the PR #65 in MDE repo in a separate library

[ahsanaman92]

Took the code from this PR: drewnoakes/metadata-extractor-dotnet#65 and compiled that into a separate library as a plugin to MDE

[Numpsy]

There are some build warnings from nullability annotations, but those can be fixed in a separate change

[Numpsy]

Note: My knowledge of the jpeg format is very basic, so I can't say for certain if the file parts are right (think we'll have to leave that part up to the original author of the MDE code)

[ahsanaman92]

Note: My knowledge of the jpeg format is very basic, so I can't say for certain if the file parts are right (think we'll have to leave that part up to the original author of the MDE code)

I did test the output image from this code with other libraries. https://github.com/Exiv2/exiv2 and XMP-Toolkit-SDK. Both of these were able to read the jpeg segments and correctly get the xmp out of that. Also, checked if this lib identifies different segments correctly as per this spec: https://docs.fileformat.com/image/jpeg/. But not knowing a lot of jpeg myself, couldn't say if something might break in the future