feat: adds regex_extract function and more type tests (#7107)

* feat: adds format, regex_extract function and more type tests

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

* fix: forgot functions

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

* chore: forgot null type

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

* test: forgot date type

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

* feat: remove format function

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

* test: update results after upgrading datafusion

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

---------

Signed-off-by: Dennis Zhuang <killme2008@gmail.com>

tests/cases/standalone/common/function/string/reverse.sql

@@ -0,0 +1,63 @@
+-- String REVERSE function tests
+
+-- Basic REVERSE function
+SELECT REVERSE('hello');
+
+SELECT REVERSE('world');
+
+SELECT REVERSE('');
+
+SELECT REVERSE(NULL);
+
+-- REVERSE with numbers and special characters
+SELECT REVERSE('12345');
+
+SELECT REVERSE('hello!');
+
+SELECT REVERSE('a!@#$%b');
+
+-- REVERSE with palindromes
+SELECT REVERSE('radar');
+
+SELECT REVERSE('madam');
+
+SELECT REVERSE('racecar');
+
+-- Test with table data
+CREATE TABLE reverse_test(s VARCHAR, ts TIMESTAMP TIME INDEX);
+
+INSERT INTO reverse_test VALUES
+    ('hello', 1000),
+    ('world', 2000),
+    ('12345', 3000),
+    ('radar', 4000),
+    ('', 5000),
+    (NULL, 6000);
+
+SELECT s, REVERSE(s) FROM reverse_test ORDER BY ts;
+
+-- Unicode REVERSE
+SELECT REVERSE('世界');
+
+SELECT REVERSE('café');
+
+SELECT REVERSE('🚀🌟');
+
+-- REVERSE with spaces
+SELECT REVERSE('hello world');
+
+SELECT REVERSE('  spaces  ');
+
+-- Combining REVERSE with other functions
+SELECT UPPER(REVERSE('hello'));
+
+SELECT REVERSE(UPPER('hello'));
+
+SELECT LENGTH(REVERSE('hello world'));
+
+-- Double REVERSE (should return original)
+SELECT REVERSE(REVERSE('hello world'));
+
+SELECT REVERSE(REVERSE('中文测试'));
+
+DROP TABLE reverse_test;