Revert "Remove added group around base type in AttributedTypeSyntax"

This reverts commit d022b8b.

Author: ahoppen

Sources/SwiftFormat/PrettyPrint/TokenStreamCreator.swift

@@ -2411,6 +2411,9 @@ private final class TokenStreamCreator: SyntaxVisitor {
       )
     }
 
+    before(node.baseType.firstToken(viewMode: .sourceAccurate), tokens: .open)
+    after(node.baseType.lastToken(viewMode: .sourceAccurate), tokens: .close)
+
     after(node.lastToken(viewMode: .sourceAccurate), tokens: .close)
     return .visitChildren
   }

Tests/SwiftFormatTests/PrettyPrint/FunctionTypeTests.swift

@@ -316,15 +316,15 @@ final class FunctionTypeTests: PrettyPrintTestCase {
       expected: """
         func f(
           _ body:
-            nonisolated(nonsending) ()
-            async -> Void
+            nonisolated(nonsending)
+            () async -> Void
         ) {}
 
         func f(
           _ body:
             @Foo @Bar
-            nonisolated(nonsending) ()
-            async -> Void
+            nonisolated(nonsending)
+            () async -> Void
         ) {}
 
         func f(
@@ -336,8 +336,8 @@ final class FunctionTypeTests: PrettyPrintTestCase {
         func f(
           _ body:
             inout @Foo @Bar
-            nonisolated(nonsending) ()
-            async -> Void
+            nonisolated(nonsending)
+            () async -> Void
         ) {}
 
         """,