Cache the inference of FunctionDef to prevent property inference mutating locals

When inferring a property, we instantiate a new `objects.Property` object,
which in turn, because it inherits from `FunctionDef`, sets itself in the locals
of the wrapping frame. This means that everytime we infer a property, the locals
are mutated with a new instance of the property.
Using `context` with `path_wrapper` would not have helped, because we call `inferred()`
on functions in multiple places in pylint's codebase.

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