- add function to get jwtclaim value directly(Azure#17166)

Add function to get jwtclaim value directly

Author: backwind1233

sdk/spring/azure-spring-boot/src/main/java/com/azure/spring/autoconfigure/aad/UserPrincipal.java

@@ -100,5 +100,13 @@ public Map<String, Object> getClaims() {
     public Object getClaim(String name) {
         return jwtClaimsSet == null ? null : jwtClaimsSet.getClaim(name);
     }
+
+    public String getName() {
+        return jwtClaimsSet == null ? null : (String) jwtClaimsSet.getClaim("name");
+    }
+
+    public String getUserPrincipalName() {
+        return jwtClaimsSet == null ? null : (String) jwtClaimsSet.getClaim("preferred_username");
+    }
 }