add virtualization type

[prksu]

This PR adds virtualization framework

I also created an example that mimics the objc example from the official documentation. While the example is working well, the other functionality still needs to be tested.

[prksu]

Added a new commit that contains more virtualization types generated using the recent docset symbol. The symbol was generated using symbolsdb with some handy adjustments, as it appears Apple made changes to the https://developer.apple.com/tutorials/data/documentation/[type].json data (not really sure actually, I never see the previous data before). i.e., the current data mostly doesn't contain /metadata/parent/title field. (I only found a few types with this field) and there is no different data between objc and swift (?language=objc url param doesn't make it different response) instead the current data has /variantOverrides field that contains jsonpatch for objc. So it required to patch the /primaryContentSections with the jsonpatch under /variantOverrides to construct objc declarations.