feat: Allow extension capability keys to contain special characters

Author: alexanderkaiser

src/main/java/io/appium/java_client/remote/options/W3CCapabilityKeys.java

@@ -23,7 +23,7 @@
 public class W3CCapabilityKeys implements Predicate<String> {
     public static final W3CCapabilityKeys INSTANCE = new W3CCapabilityKeys();
     private static final Predicate<String> ACCEPTED_W3C_PATTERNS = Stream.of(
-                    "^[\\w-]+:.*$",
+                    "^[^:]+:.*$",
                     "^acceptInsecureCerts$",
                     "^browserName$",
                     "^browserVersion$",

src/test/java/io/appium/java_client/remote/options/BaseOptionsTest.java

@@ -0,0 +1,26 @@
+package io.appium.java_client.remote.options;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class BaseOptionsTest {
+
+
+  @ParameterizedTest
+  @CsvSource({
+      "test, appium:test",
+      "appium:test, appium:test",
+      "browserName, browserName",
+      "digital.ai:accessKey, digital.ai:accessKey",
+      "digital-ai:accessKey, digital-ai:accessKey",
+      "<VENDOR-KEY>:<CAP-NAME>:<SUB-CAP-NAME>, <VENDOR-KEY>:<CAP-NAME>:<SUB-CAP-NAME>",
+      "digital-ai:my_custom-cap:xyz, digital-ai:my_custom-cap:xyz",
+      "digital-ai:my_custom-cap?xyz, digital-ai:my_custom-cap?xyz",
+  })
+  void verifyW3CMapping(String capName, String expected) {
+    var w3cName = BaseOptions.toW3cName(capName);
+    assertEquals(expected, w3cName);
+  }
+}