[build] Roll nomnigraph build into caffe2 #11303
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We need to remove nomnigraph from the list of public libraries in order to support libtorch extensions. Easiest way to do this is to include it into the Caffe2 source like all other caffe2/core/ code.
However, because the headers are in a different place, we need to include them for linked libraries (pybind, tests, etc).
On an upside, this means that nomnigraph is now default hidden visibility too.
FYI @peterjc123 @xkszltl @goldsborough @bwasti @Yangqing