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

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

Zkplo opened a new issue, #11239:
URL: https://github.com/apache/inlong/issues/11239

   ### Description
   
   - parent issue #10796 
   - MySql Official Description: https://dev.mysql.com/doc/refman/8.4/en/string-functions.html#function_instr
   
   INSTR(str,substr): Returns the position of the first occurrence of substring substr in string str. 
   This is the same as LOCATE(). So just add the instr function name in locateFunction.
   
   ### Use case
   
   ```sql
   INSTR('foobarbar', 'bar');   -> 4
   INSTR('xbar', 'foobar');     -> 0
   ```
   
   ### 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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