VectorDrawable native rendering - Step 1 of MANY

Implement path parsing from string to skia path in native. The parsing
contains two main stages:
1) Parse string into a list of nodes that contains one operation (such
   as move) and a vector of floats as params for that operation.
2) Interpret the operations defined in the nodes into SkPath operations,
   and create a skia path

Also provided unit test for parsing a string path into a list of nodes,
and then to a skia path.

Change-Id: I0ce13df5e3bb90987dcdc80fe8b039af175ad2e2

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