[mlir][Transforms][NFC] `GreedyPatternRewriteDriver`: Use composition instead...

[mlir][Transforms][NFC] `GreedyPatternRewriteDriver`: Use composition instead of inheritance (#92785)

This commit simplifies the design of the `GreedyPatternRewriterDriver`
class. This class used to inherit from both `PatternRewriter` and
`RewriterBase::Listener` and then attached itself as a listener.

In the new design, the class has a `PatternRewriter` field instead of
inheriting from `PatternRewriter`, which is generally perferred in
object-oriented programming.

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Co-authored-by: Markus Böck <markus.boeck02@gmail.com>