Parse generic function types in import type argument lists (#31079)

* Parenthesize in import type node factory

* And now parse unparenthesized generic functions so we can handle parsing the older output

src/compiler/factory.ts

@@ -845,7 +845,7 @@ namespace ts {
         const node = <ImportTypeNode>createSynthesizedNode(SyntaxKind.ImportType);
         node.argument = argument;
         node.qualifier = qualifier;
-        node.typeArguments = asNodeArray(typeArguments);
+        node.typeArguments = parenthesizeTypeParameters(typeArguments);
         node.isTypeOf = isTypeOf;
         return node;
     }

src/compiler/parser.ts

@@ -2922,7 +2922,9 @@ namespace ts {
             if (parseOptional(SyntaxKind.DotToken)) {
                 node.qualifier = parseEntityName(/*allowReservedWords*/ true, Diagnostics.Type_expected);
             }
-            node.typeArguments = tryParseTypeArguments();
+            if (!scanner.hasPrecedingLineBreak() && reScanLessThanToken() === SyntaxKind.LessThanToken) {
+                node.typeArguments = parseBracketedList(ParsingContext.TypeArguments, parseType, SyntaxKind.LessThanToken, SyntaxKind.GreaterThanToken);
+            }
             return finishNode(node);
         }