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Functions are always callable operations and thus every operation implementing the `FunctionOpInterface` also implements the `CallableOpInterface`. The only exception was the FuncOp in the toy example. To make implementation of the `FunctionOpInterface` easier, this commit lets `FunctionOpInterface` inherit from `CallableOpInterface` and merges some of their methods. More precisely, the `CallableOpInterface` has methods to get the argument and result attributes and a method to get the result types of the callable region. These methods are always implemented the same way as their analogues in `FunctionOpInterface` and thus this commit moves all the argument and result attribute handling methods to the callable interface as well as the methods to get the argument and result types. The `FuntionOpInterface` then does not have to declare them as well, but just inherits them from the `CallableOpInterface`. Adding the inheritance relation also required to move the `FunctionOpInterface` from the IR directory to the Interfaces directory since IR should not depend on Interfaces. Reviewed By: jpienaar, springerm Differential Revision: https://reviews.llvm.org/D157988
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