DataFusion not using NDV stat

### Describe the bug

This was brought up before here https://github.com/apache/datafusion/issues/15265
From the top of my head my I think we could use these in:
- Join swapping strategy
- Optimal number of partitions in Hash Join partitioning where we use Hash Partitioning.
- Filter pushdown decision: if we have an very low NDV it might not be worth pushing down // computing predicates?

This would likely require further investigation into how other query engines use NDV for optimization decisions 🤔

### To Reproduce

_No response_

### Expected behavior

ndv being used

### Additional context

_No response_

Read the linked issue #15265 first, then investigate how NDV statistics could affect join swapping, hash-join partition counts, and filter-pushdown decisions. Done means NDV is used for at least one justified optimization decision, with the behavior validated by appropriate tests.

Written by the indexing model from the issue text.