Add a .list.apply() expression

[MisterKloudy]

Would apply a function on each element in the list

Example:

df = daft.from_pydict({"a": [["HeLLo WoRlD", "Hi", "WelCoMe"], ["tO", "a New WoRlD"]]})
df.with_column("b", col("a").list.apply(element().str.lower())).select("b").show()

Expected output:

╭─────────────╮
│ b           │ 
│ ---         │
│ List[Struct[value: Utf8, count: Int32]] │
╞═════════════╡
│ [["hello world", "hi", "welcome"]]   │
├╌╌╌╌╌╌╌╌╌╌╌╌╌┤
│ ["to", "a new world"]   │
╰─────────────╯

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