FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

node_modules/level-js/util/deserialize.js

@@ -0,0 +1,44 @@
+'use strict'
+
+var Buffer = require('buffer').Buffer
+var ta2str = (function () {
+  if (global.TextDecoder) {
+    var decoder = new TextDecoder('utf-8')
+    return decoder.decode.bind(decoder)
+  } else {
+    return function ta2str (ta) {
+      return ta2buf(ta).toString()
+    }
+  }
+})()
+
+var ab2str = (function () {
+  if (global.TextDecoder) {
+    var decoder = new TextDecoder('utf-8')
+    return decoder.decode.bind(decoder)
+  } else {
+    return function ab2str (ab) {
+      return Buffer.from(ab).toString()
+    }
+  }
+})()
+
+function ta2buf (ta) {
+  var buf = Buffer.from(ta.buffer)
+
+  if (ta.byteLength === ta.buffer.byteLength) {
+    return buf
+  } else {
+    return buf.slice(ta.byteOffset, ta.byteOffset + ta.byteLength)
+  }
+}
+
+module.exports = function (data, asBuffer) {
+  if (data instanceof Uint8Array) {
+    return asBuffer ? ta2buf(data) : ta2str(data)
+  } else if (data instanceof ArrayBuffer) {
+    return asBuffer ? Buffer.from(data) : ab2str(data)
+  } else {
+    return asBuffer ? Buffer.from(String(data)) : String(data)
+  }
+}