Add net stdlib module with URL support (#1834)

pkl-codegen-java/src/main/kotlin/org/pkl/codegen/java/JavaCodeGenerator.kt

@@ -845,6 +845,7 @@ class JavaCodeGenerator(
           PClassInfo.Class -> PCLASS.nullableIf(nullable)
           PClassInfo.Regex -> PATTERN.nullableIf(nullable)
           PClassInfo.Version -> VERSION.nullableIf(nullable)
+          PClassInfo.Url -> URI.nullableIf(nullable)
           else ->
             when {
               !classInfo.isStandardLibraryClass -> pClass.toJavaPoetName().nullableIf(nullable)

pkl-codegen-java/src/test/kotlin/org/pkl/codegen/java/JavaCodeGeneratorTest.kt

@@ -1159,6 +1159,52 @@ class JavaCodeGeneratorTest {
       )
   }
 
+  @Test
+  fun `pkl_net Url`() {
+    val javaCode =
+      generateJavaCode(
+        """
+        module mod
+
+        import "pkl:net"
+
+        url: net.Url
+        nullableUrl: net.Url?
+        listing: Listing<net.Url>
+        mapping: Mapping<String, net.Url>
+
+        class Foo {
+          url: net.Url
+        }
+        """
+          .trimIndent()
+      )
+
+    assertThat(javaCode)
+      .compilesSuccessfully()
+      .contains("import java.net.URI;")
+      .contains(
+        """
+        |public final class Mod {
+        |  public final @NonNull URI url;
+        |
+        |  public final URI nullableUrl;
+        |
+        |  public final @NonNull List<@NonNull URI> listing;
+        |
+        |  public final @NonNull Map<@NonNull String, @NonNull URI> mapping;
+        """
+          .trimMargin()
+      )
+      .contains(
+        """
+        |  public static final class Foo {
+        |    public final @NonNull URI url;
+        """
+          .trimMargin()
+      )
+  }
+
   @Test
   fun `nullable properties`() {
     var javaCode =