[Feature][SDK] Transform support STR_TO_MAP() function

parent issue: #10796
from flinksql: https://nightlies.apache.org/flink/flink-docs-master/docs/dev/table/functions/systemfunctions/#string-functions
STR_TO_MAP(string1[, string2, string3])--Returns a map after splitting the string1 into key/value pairs using delimiters. string2 is the pair delimiter, default is ‘,’. And string3 is the key-value delimiter, default is ‘=’. Both pair delimiter and key-value delimiter are treated as regular expressions. So special characters (e.g. <([{\^-=$!|]})?*+.>) need to be properly escaped before using as a delimiter literally.

STR_TO_MAP('item1:10,item2:5,item3:2', ':', ',')--{'item1' -> 10, 'item2' -> 5, 'item3' -> 2}

apache / inlong