regexp_extract func from Spark

### Is your feature request related to a problem or challenge?

Yes

### Describe the solution you'd like

I'd like to implement [regexp_extract](https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/api/pyspark.sql.functions.regexp_extract.html) func like Scalar UDF

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

Start by reading the linked PySpark regexp_extract documentation and inspect DataFusion's existing scalar UDF functions. The work is done when an equivalent regexp_extract function is available as a scalar UDF with behavior matching the referenced Spark function.

Written by the indexing model from the issue text.