sendOffer
suspend fun sendOffer(ownerWebId: String, receiverWebId: String, resourceUri: String, mode: ShareMode, resourceType: String? = null, resourceName: String? = null)
Notifies receiverWebId that ownerWebId has granted them mode access to resourceUri. resourceType / resourceName describe the object of a typed (entity) share — the entity's RDF class IRI and human title; both null for plain resource shares.