26508051a4
Summary: Clients of `Graph` that wish to treat the graph as immutable will benefit from a `copy` method. We should provide it on `Graph` instead of asking clients to reimplement it because it affords us the opportunity to get the type signature right: in particular, copying should allow upcasting of the type parameters, even though `Graph` itself is invariant. Paired with @dandelionmane. Test Plan: Unit tests added. Run `yarn flow` and `yarn test`. To check that downcasting is not allowed, change the types in the new static test case in `graph.test.js` to be contravariant instead of covariant, and note that `yarn flow` fails. wchargin-branch: graph-copy
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