feat(packages): add commons package

This is an import of 166ca8da12
with some changes to make it fit into the mono repo.
- TypedEventEmitter has been replaced with EventEmitter2 because EventEmitter2 is faster and TypedEventEmitter had some troubles with the new way of compiling.
- tsc-esm has been replaced with microbundle. The problems that lib0 doesn't export its types correctly has been solved using yarn patch.

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

commons/src/index.ts

@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export { MessageType } from './messages/message-type.enum.js'
+export { ConnectionKeepAliveHandler } from './connection-keep-alive-handler.js'
+export { YDocMessageTransporter } from './y-doc-message-transporter.js'
+export {
+  applyAwarenessUpdateMessage,
+  encodeAwarenessUpdateMessage
+} from './messages/awareness-update-message.js'
+export {
+  applyDocumentUpdateMessage,
+  encodeDocumentUpdateMessage
+} from './messages/document-update-message.js'
+export { encodeCompleteAwarenessStateRequestMessage } from './messages/complete-awareness-state-request-message.js'
+export { encodeCompleteDocumentStateRequestMessage } from './messages/complete-document-state-request-message.js'
+export { encodeCompleteDocumentStateAnswerMessage } from './messages/complete-document-state-answer-message.js'
+export { encodeDocumentDeletedMessage } from './messages/document-deleted-message.js'
+export { encodeMetadataUpdatedMessage } from './messages/metadata-updated-message.js'
+export { encodeServerVersionUpdatedMessage } from './messages/server-version-updated-message.js'
+
+export { WebsocketTransporter } from './websocket-transporter.js'
+
+export type { MessageTransporterEvents } from './y-doc-message-transporter.js'