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This patch adds a new matching method for data formatters, in addition to the existing exact typename and regex-based matching. The new method allows users to specify the name of a Python callback function that takes a `SBType` object and decides whether the type is a match or not. Here is an overview of the changes performed: - Add a new `eFormatterMatchCallback` matching type, and logic to handle it in `TypeMatcher` and `SBTypeNameSpecifier`. - Extend `FormattersMatchCandidate` instances with a pointer to the current `ScriptInterpreter` and the `TypeImpl` corresponding to the candidate type, so we can run registered callbacks and pass the type to them. All matcher search functions now receive a `FormattersMatchCandidate` instead of a type name. - Add some glue code to ScriptInterpreterPython and the SWIG bindings to allow calling a formatter matching callback. Most of this code is modeled after the equivalent code for watchpoint callback functions. - Add an API test for the new callback-based matching feature. For more context, please check the RFC thread where this feature was originally discussed: https://discourse.llvm.org/t/rfc-python-callback-for-data-formatters-type-matching/64204/11 Differential Revision: https://reviews.llvm.org/D135648