feat: Adding lit_series func

[Bidek56]

Adding lit_series func to lit Series into LiteralValue to close #351

[universalmind303]

so i think we need to be pretty careful about adding this in to the lazy dsl. The lazyframes will do broadcasting which can be very confusing and produce unexpected results.

as such this is invalid.

pl.DataFrame({"text": ["hello"]}).lazy().select("text", pl.Series("series",[1,2,3])).collectSync()

but these are valid

pl.DataFrame({"text": ["hello"]}).lazy().select(pl.Series("series",[1,2,3])).collectSync()
pl.DataFrame({"text": ["hello"]}).lazy().select("text", pl.Series("series",[1])).collectSync()

If we want to introduce this, we'll need A LOT more tests to ensure broadcasting and various edge cases are consistent with rs and py polars.

[Bidek56]

so i think we need to be pretty careful about adding this in to the lazy dsl. The lazyframes will do broadcasting which can be very confusing and produce unexpected results.

as such this is invalid.

pl.DataFrame({"text": ["hello"]}).lazy().select("text", pl.Series("series",[1,2,3])).collectSync()

but these are valid

pl.DataFrame({"text": ["hello"]}).lazy().select(pl.Series("series",[1,2,3])).collectSync()
pl.DataFrame({"text": ["hello"]}).lazy().select("text", pl.Series("series",[1])).collectSync()

If we want to introduce this, we'll need A LOT more tests to ensure broadcasting and various edge cases are consistent with rs and py polars.

The cases shown above behave the same as in py polars. I will look for more test cases. Thx

[universalmind303]

The cases shown above behave the same as in py polars. I will look for more test cases. Thx

if it works in py-ppolars, thats good enough for me!

[Bidek56]

The cases shown above behave the same as in py polars. I will look for more test cases. Thx

if it works in py-ppolars, thats good enough for me!

This PR fixes series struct tests, which is a big win!