Enable stubbing and function contracts for primitive types #3496
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Previously, Kani was not able to resolve methods that belong to primitive types, which would not allow users to specify primitive types as stub target, neither for contracts.
Thus, extend the name resolution to be able to convert a type expression into a
Ty
for primitive types, and add a new method to search for function implementation for primitive types.I also moved the type resolution logic to its own module to make it a bit cleaner.
Resolves #2646
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