addMember method
Adds a member to this bundle.
The optional metadata map is attached to the membership edge and
can later be inspected via getMembershipHistory.
await bundle.addMember(hero.kref, metadata: {'role': 'hero'});
Implementation
Future<void> addMember(Kref memberKref, {Map<String, String>? metadata}) async {
await client.addBundleMember(kref.uri, memberKref.uri, metadata: metadata);
}