[MLIR][Python] Support dialect conversion in python bindings (#177782) This PR adds dialect conversion support to the MLIR Python bindings. Because it introduces a number of new APIs, it’s a fairly large PR. It mainly includes the following parts: * Add a set of types and APIs to the C API, including `MlirConversionTarget`, `MlirConversionPattern`, `MlirTypeConverter`, `MlirConversionPatternRewriter`, and others. * Add the corresponding types and APIs to the Python bindings. * Extend `mlir-tblgen` with codegen for Python adaptor classes, which generates an adaptor class for each op. Note that this PR only adds support for 1-to-1 conversions, 1-to-N type/value conversions are not supported yet. --------- Co-authored-by: Maksim Levental <maksim.levental@gmail.com>
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