feat: Add `SPLIT_PART` string function to the SQL interface...
Adds SQL support for the Example importpolarsaspldf=pl.DataFrame({"s": ["xx,yy,zz","abc,,xyz,???,hmm",None,""]})df.sql("""SELECTs,SPLIT_PART(s,',',1) AS "s+1",SPLIT_PART(s,',',3) AS "s+3",SPLIT_PART(s,',',-2) AS