feat: Implement grammar to support Select as FromItem

Refs: #2071

Author: Stefan Steinhauser

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -3052,21 +3052,23 @@ FromItem FromItem() #FromItem:
 }
 {
     (
-        LOOKAHEAD(3) fromItem = Values()
+        LOOKAHEAD(3, { !getAsBoolean(Feature.allowUnparenthesizedSubSelects) }) fromItem = Values()
         |
         LOOKAHEAD( TableFunction() ) fromItem=TableFunction()
         |
         LOOKAHEAD(3) fromItem=Table()
         |
         LOOKAHEAD( ParenthesedFromItem() ) fromItem = ParenthesedFromItem()
         |
-        LOOKAHEAD(3) (
+        LOOKAHEAD(3, { !getAsBoolean(Feature.allowUnparenthesizedSubSelects) }) (
             fromItem=ParenthesedSelect()
             [ LOOKAHEAD(2) pivot=Pivot() { fromItem.setPivot(pivot); } ]
             [ LOOKAHEAD(2) unpivot=UnPivot() { fromItem.setUnPivot(unpivot); } ]
         )
         |
         fromItem=LateralSubSelect()
+        |
+        LOOKAHEAD({ getAsBoolean(Feature.allowUnparenthesizedSubSelects) }) fromItem=Select()
     )
 
     [ LOOKAHEAD(2) alias=Alias() { fromItem.setAlias(alias); } ]

src/test/java/net/sf/jsqlparser/statement/select/SelectTest.java

@@ -5963,7 +5963,11 @@ void testGroupByWithHaving() throws JSQLParserException {
     @ValueSource(strings = {
             "SELECT SELECT 1",
             "SELECT 1 WHERE 1 = SELECT 1",
-            "SELECT 1 WHERE 1 IN SELECT 1"
+            "SELECT 1 WHERE 1 IN SELECT 1",
+            "SELECT * FROM SELECT 1",
+            "SELECT * FROM SELECT SELECT 1",
+            "SELECT * FROM SELECT 1 WHERE 1 = SELECT 1",
+            "SELECT * FROM SELECT 1 WHERE 1 IN SELECT 1"
     })
     public void testUnparenthesizedSubSelect(String sqlStr) throws JSQLParserException {
         TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true,