Compute the binding coverage of the type inference

[radeusgd]

Pull Request Description

Prototype of a tool that allows us to compute what % of bindings inside of methods have some inferred type (other than 'Any').

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[radeusgd]

In #12901 I discovered the type inference was completely skipping inferring code of methods that have default arguments - which is many methods.

With this prototype 'coverage' tool I managed to measure that fixing this omission has increased the 'coverage' by ~50%: