refactor: add Pubkey, Privkey, NoteId string aliases

This is a non-behavioral change in preparation for the actual switchover
from Strings to Ids. The purpose of this kit is to reduce the size of
the switchover commit which is going to be very large.

damus/Views/Events/BuilderEventView.swift

@@ -9,7 +9,7 @@ import SwiftUI
 
 struct BuilderEventView: View {
     let damus: DamusState
-    let event_id: String
+    let event_id: NoteId
     @State var event: NostrEvent?
     @State var subscription_uuid: String = UUID().description
     
@@ -19,7 +19,7 @@ struct BuilderEventView: View {
         self.event_id = event.id
     }
     
-    init(damus: DamusState, event_id: String) {
+    init(damus: DamusState, event_id: NoteId) {
         let event = damus.events.lookup(event_id)
         self.event_id = event_id
         self.damus = damus