feat: event message_ciphertext (#2292)

* add option cipherMsg

* add event  message_ciphertext

* example

* remove option cipherMsg

* removing unlinked code

* Update Client.js

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Co-authored-by: Shir Serlui <70711723+shirser121@users.noreply.github.com>
Co-authored-by: alechkos <93551621+alechkos@users.noreply.github.com>

src/util/Constants.js

@@ -44,6 +44,7 @@ exports.Events = {
     CHAT_REMOVED: 'chat_removed',
     CHAT_ARCHIVED: 'chat_archived',
     MESSAGE_RECEIVED: 'message',
+    MESSAGE_CIPHERTEXT: 'message_ciphertext',
     MESSAGE_CREATE: 'message_create',
     MESSAGE_REVOKED_EVERYONE: 'message_revoke_everyone',
     MESSAGE_REVOKED_ME: 'message_revoke_me',