[I] [Feature][SDK] Transform SQL supports FIND_IN_SET function [inlong]

["Zkplo (via GitHub)" <gi...@apache.org>]

Zkplo opened a new issue, #11236:
URL: https://github.com/apache/inlong/issues/11236

   ### Description
   
   - parent issue #10796 
   - MySql Official Description: https://dev.mysql.com/doc/refman/8.4/en/string-functions.html#function_find-in-set
   
   FIND_IN_SET(str,strlist): Returns a value in the range of 1 to N if the string str is in the string list strlist consisting of N substrings. A string list is a string composed of substrings separated by , characters.  Returns 0 if str is not in strlist or if strlist is the empty string. Returns NULL if either argument is NULL. This function does not work properly if the first argument contains a comma (,) character.
   
   ### Use case
   
   ```sql
   FIND_IN_SET('b','a,b,c,d');    -> 2
   ```
   
   ### Are you willing to submit PR?
   
   - [X] Yes, I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)
   


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