[feature](function) support ngram_search function (#38226) #40894
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#38226
mysql [test]>select ngram_search('123456789' , '12345' , 3); +---------------------------------------+
| ngram_search('123456789', '12345', 3) |
+---------------------------------------+
| 0.6 |
+---------------------------------------+
1 row in set (0.01 sec)
mysql [test]>select ngram_search("abababab","babababa",2); +-----------------------------------------+
| ngram_search('abababab', 'babababa', 2) |
+-----------------------------------------+
| 1 |
+-----------------------------------------+
1 row in set (0.01 sec)