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Add `gen-type-constraint-decls` and `gen-type-constraint-defs`, which generate public C++ functions for type constraints. The name of the C++ function is specified in the `cppFunctionName` field. Type constraints are typically used for op/type/attribute verification. They are also sometimes called from builders and transformations. Until now, this required duplicating the check in C++. Note: This commit just adds the option for type constraints, but attribute constraints could be supported in the same way. Alternatives considered: 1. The C++ functions could also be generated as part of `gen-typedef-decls/defs`, but that can be confusing because type constraints may rely on type definitions from multiple `.td` files. `#include`s could cause duplicate definitions of the same type constraint. 2. The C++ functions could also be generated as static member functions of dialects, but they don't really belong to a dialect. (Because they may rely on type definitions from multiple dialects.)
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