Support ends_with function (#2746)

docs/documentation/cn/sql-reference/sql-functions/string-functions/ends_with.md

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+
+# ends_with
+## description
+### Syntax
+
+`BOOLEAN ENDS_WITH (VARCHAR str, VARCHAR suffix)`
+
+如果字符串以指定后缀结尾，返回true。否则，返回false。任意参数为NULL，返回NULL。
+
+## example
+
+```
+mysql> select ends_with("Hello doris", "doris");
++-----------------------------------+
+| ends_with('Hello doris', 'doris') |
++-----------------------------------+
+|                                 1 | 
++-----------------------------------+
+
+mysql> select ends_with("Hello doris", "Hello");
++-----------------------------------+
+| ends_with('Hello doris', 'Hello') |
++-----------------------------------+
+|                                 0 | 
++-----------------------------------+
+```
+##keyword
+ENDS_WITH