Support right (outer) joins in pl.LazyFrame

[OneRaynyDay]

Right joins

Currently, pl.LazyFrame supports the following types of joins:

“inner” “left” “outer” “asof”, “cross” “semi” “anti”

One type of join that is missing from here is a right join. Of course, one could just join the two lazyframes in the other order:

lf1.join(lf2, how="right", ...) == lf2.join(lf1, how="left", ...)

but often times this expression is chained in a long lazy transformation which makes the above^ substitution harder to perform. I took a look at the join implementation and it seems relatively simple to swap lf1, lf2 within based on how. Let me know if I'm missing anything, thanks!