[mlir][Transforms] Encapsulate dialect conversion options in `ConversionConfig` (#83754)

This commit adds a new `ConversionConfig` struct that allows users to
customize the dialect conversion. This configuration is similar to
`GreedyRewriteConfig` for the greedy pattern rewrite driver.

A few existing options are moved to this objects, simplifying the
dialect conversion API.

This is a re-upload of #82250. The Windows build breakage was fixed in #83768.

This reverts commit 60fbd605.