[MLIR][Python] Support dialect conversion in python bindings (#177782)HEADmain

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.

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Co-authored-by: Maksim Levental <maksim.levental@gmail.com>

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