[MLIR][Python] Rename `GreedyRewriteDriverConfig` to `GreedyRewriteConfig` (#175409)
This is mainly for two purposes:
1. to keep it consistent with the C++ class name
`mlir::GreedyRewriteConfig`,
2. to make it shorter.
Since this type was only added a few days ago
(654b3e844f21d3f64521e9cb028efdfebbf99bb4), it shouldn’t cause any
obvious compatibility issues.