feat: implement Locator.filter (#925)

Author: yury-s

playwright/src/main/java/com/microsoft/playwright/impl/LocatorImpl.java

@@ -204,7 +204,7 @@ public void fill(String value, FillOptions options) {
 
   @Override
   public Locator filter(FilterOptions options) {
-    return null;
+    return new LocatorImpl(frame, selector, convertType(options,LocatorOptions.class));
   }
 
   @Override

playwright/src/test/java/com/microsoft/playwright/TestPageLocatorQuery.java

@@ -134,4 +134,19 @@ void shouldSupportHasLocator() {
     assertThat(page.locator("div", new Page.LocatorOptions()
         .setHas(page.locator("span")).setHasText("wor"))).hasCount(1);
   }
+
+  @Test
+  void shouldSupportLocatorFilter() {
+    page.setContent("<section><div><span>hello</span></div><div><span>world</span></div></section>");
+    assertThat(page.locator("div").filter(new Locator.FilterOptions().setHasText("hello"))).hasCount(1);
+    assertThat(page.locator("div", new Page.LocatorOptions().setHasText("hello")).filter(new Locator.FilterOptions().setHasText("hello"))).hasCount(1);
+    assertThat(page.locator("div", new Page.LocatorOptions().setHasText("hello")).filter(new Locator.FilterOptions().setHasText("world"))).hasCount(0);
+    assertThat(page.locator("section", new Page.LocatorOptions().setHasText("hello")).filter(new Locator.FilterOptions().setHasText("world"))).hasCount(1);
+    assertThat(page.locator("div").filter(new Locator.FilterOptions().setHasText("hello")).locator("span")).hasCount(1);
+    assertThat(page.locator("div").filter(new Locator.FilterOptions().setHas(page.locator("span", new Page.LocatorOptions().setHasText("world"))))).hasCount(1);
+    assertThat(page.locator("div").filter(new Locator.FilterOptions().setHas(page.locator("span")))).hasCount(2);
+    assertThat(page.locator("div").filter(new Locator.FilterOptions()
+      .setHas(page.locator("span"))
+      .setHasText("world"))).hasCount(1);
+  }
 }