Add support for regexp_extract_all on GPU

[anthony-chang]

Closes #4283, closes #4353

Depends on: rapidsai/cudf#11196 rapidsai/cudf#11215 being merged first

This PR adds support for Spark's regexp_extract_all

• For idx = 0, this maps cleanly to cuDF's findall_record
• For idx > 0, cuDF's extract_all_record doesn't let you specify an index, so it's a bit more complicated:

1. cudf::strings::extract_all_record returns a list column containing all the matches, but we only want the ones specified by the group idx
2. So we extract the strings we want from the lists by extracting every nth element (n = number of capture groups in the regex pattern) starting from idx. We do this with ColumnVector.extractListElement for each index we want.
3. ColumnVector.extractListElement returns null when the index is out of bounds of a list, so we then filter out the null values in the lists.
4. Lastly, if the input is null, the above would give an empty list, but we instead want to output null.

[anthony-chang]

build

[anthony-chang]

build

[pxLi]

build