lance-format / lance-format/lance

Add optimizer rule to change `LanceScanExec -> FilterExec` into `FilteredReadExec`

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Description

There are query plans like this one that could benefit from pushing down the filter:

https://github.com/lancedb/lance/blob/35a0547426c47dd94425619c442dcd03ffd9860c/rust/lance/src/dataset/scanner.rs#L7157-L7158

Note: this will become obsolete if we change Scanner to construct a logical plan using the LanceTableProvider since pushdown can be handled at that layer. However, that's a ways off.

https://github.com/lancedb/lance/blob/35a0547426c47dd94425619c442dcd03ffd9860c/rust/lance/src/datafusion/dataframe.rs#L147-L158

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