Unified Storage: Add SQL template package (#87524)

* added sqltemplate package

* addded example

* fix linting issues

* improve code readability

* fix documentation

pkg/services/store/entity/sqlstash/sqltemplate/dialect_mysql.go

@@ -0,0 +1,18 @@
+package sqltemplate
+
+// MySQL is an implementation of Dialect for the MySQL DMBS. It relies on having
+// ANSI_QUOTES SQL Mode enabled. For more information about ANSI_QUOTES and SQL
+// Modes see:
+//
+//	https://dev.mysql.com/doc/refman/8.4/en/sql-mode.html#sqlmode_ansi_quotes
+var MySQL mysql
+
+var _ Dialect = MySQL
+
+type mysql struct {
+	standardIdent
+}
+
+func (mysql) SelectFor(s ...string) (string, error) {
+	return rowLockingClauseAll(true).SelectFor(s...)
+}