chore: implement regression test for push down panic

[rtyler]

See #2602

[abhiaagarwal]

@rtyler I haven't tested this yet, but try:

delta-rs/crates/core/src/delta_datafusion/mod.rs

Lines 699 to 704 in df6e6fd

	fn supports_filters_pushdown(
	&self,
	_filter: &[&Expr],
	) -> DataFusionResult<Vec<TableProviderFilterPushDown>> {
	Ok(vec![TableProviderFilterPushDown::Inexact])
	}

Ok(filter.into_iter().map(|_| TableProviderFilterPushDown::Inexact).collect())

or something of this nature.

[rtyler]

@abhiaagarwal I gave that a try in a small slot of time I had yesterday with no success, I haven't been able to spend more time with the problem yet 😦

[abhiaagarwal]

@rtyler there's also the same slip of logic below it, did you change both spots?

delta-rs/crates/core/src/delta_datafusion/mod.rs

Lines 778 to 783 in df6e6fd

	fn supports_filters_pushdown(
	&self,
	_filter: &[&Expr],
	) -> DataFusionResult<Vec<TableProviderFilterPushDown>> {
	Ok(vec![TableProviderFilterPushDown::Inexact])
	}

I'm not even sure these need to be Inexact as well. Might be worth telling Datafusion it gives exact results and seeing what happens :)