Enable parsing multiple statements without BEGIN/END

Author: aharpervc

src/dialect/mssql.rs

@@ -254,7 +254,7 @@ impl MsSqlDialect {
         } else {
             BeginEndStatements {
                 begin_token: AttachedToken::empty(),
-                statements: vec![parser.parse_statement()?],
+                statements: parser.parse_statements()?,
                 end_token: AttachedToken::empty(),
             }
         };

tests/sqlparser_mssql.rs

@@ -2256,6 +2256,14 @@ fn parse_create_trigger() {
         }
     );
 
+    let multi_statement_as_trigger = "\
+        CREATE TRIGGER some_trigger ON some_table FOR INSERT \
+        AS \
+        DECLARE @var INT; \
+        RAISERROR('Trigger fired', 10, 1);\
+    ";
+    let _ = ms().verified_stmt(multi_statement_as_trigger);
+
     let multi_statement_trigger = "\
         CREATE TRIGGER some_trigger ON some_table FOR INSERT \
         AS \