Added native support for StsWebIdentityCredentialsProviderFactory, as this is used with reflection on class WebIdentityCredentialsUtils (#3976)

Co-authored-by: Zoe Wang <[email protected]>

Author: martinKindall

.changes/next-release/bugfix-AWSSDKforJavav2-ead14e4.json

@@ -0,0 +1,6 @@
+{
+    "category": "AWS SDK for Java v2", 
+    "contributor": "martinKindall", 
+    "type": "bugfix", 
+    "description": "STS was being skipped in the default credential provider chain when using native builds in java. Now a proper reflect-config.json file was added to include sts."
+}

services/sts/src/main/resources/META-INF/native-image/software.amazon.awssdk/sts/reflect-config.json

@@ -0,0 +1,11 @@
+[
+  {
+    "name": "software.amazon.awssdk.services.sts.internal.StsWebIdentityCredentialsProviderFactory",
+    "methods": [
+      {
+        "name": "<init>",
+        "parameterTypes": []
+      }
+    ]
+  }
+]