Explore folding `MappedStrategy` and `FilteredStrategy` into `TransformStrategy`

[Liam-DeVoe]

This is a pretty exploratory issue. I think this is worth doing to simplify our special optimization handling by separate strategies for combined map/filters, for example SampledFromStrategy.

I don't know if this will cause problems for e.g. type hints or LazyStrategy, but I think it's worth finding out.

Useful previous references (mostly for my own reading):

• Extend special casing of sampled_from in unique collections #2036 / Special-case sampled_from(...).filter(...).map(...) in unique collections #2688
• Rewrite simple filters for bounded integers() #2853
• Rewrite length filters for diverse collection types #3895