🐛 [firebase_dynamic_links] can not get utmParameters from PendingDynamicLinkData

[garlicsoft]

Bug report

Describe the bug
can not get utmParameters from PendingDynamicLinkData

Steps to reproduce

Steps to reproduce the behavior:

FirebaseDynamicLinks.instance
.getInitialLink()
.then((dynamicLinkData) {});
I can not get utmParameters from dynamicLinkData.

in android/src/main/java/io/flutter/plugins/firebase/dynamiclinks/Utils.java

for (String key : pendingDynamicLinkData.getUtmParameters().keySet()) {
    utmParameters.put(key, pendingDynamicLinkData.getUtmParameters().get(key).toString());
}
 dynamicLink.put("utmParameters", utmParameters);

can not get any parameters

Expected behavior

• fix the bug in Utils.java
• add property utmParameters in PendingDynamicLinkData

[darshankawar]

/cc @russellwheatley