Channel chat: Add edit message (#9035)

**Summary**:
- Removed reply message from message_menu
- Made render_popover_buttons a bit more reusable
- Fixed issue that you can't close the reply/edit preview when you are
not focusing the message editor
- Notify only the new people that were mentioned inside the edited
message

**Follow up**
- Fix that we update the notification message for the people that we
mentioned already
- Fix that we remove the notification when a message gets deleted.
  - Fix last acknowledge message id is in correct now

**Todo**:
- [x] Add tests
- [x] Change new added bindings to the `Editor::Cancel` event.

Release Notes:

- Added editing of chat messages
([#6707](https://github.com/zed-industries/zed/issues/6707)).

<img width="239" alt="Screenshot 2024-03-09 at 11 55 23"
src="https://github.com/zed-industries/zed/assets/62463826/b0949f0d-0f8b-43e1-ac20-4c6d40ac41e1">
<img width="240" alt="Screenshot 2024-03-13 at 13 34 23"
src="https://github.com/zed-industries/zed/assets/62463826/d0636da2-c5aa-4fed-858e-4bebe5695ba7">

---------

Co-authored-by: Bennet Bo Fenner <53836821+bennetbo@users.noreply.github.com>
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/rpc/src/proto.rs

@@ -149,6 +149,7 @@ messages!(
     (CallCanceled, Foreground),
     (CancelCall, Foreground),
     (ChannelMessageSent, Foreground),
+    (ChannelMessageUpdate, Foreground),
     (CompleteWithLanguageModel, Background),
     (CopyProjectEntry, Foreground),
     (CountTokensWithLanguageModel, Background),
@@ -244,6 +245,7 @@ messages!(
     (ReloadBuffersResponse, Foreground),
     (RemoveChannelMember, Foreground),
     (RemoveChannelMessage, Foreground),
+    (UpdateChannelMessage, Foreground),
     (RemoveContact, Foreground),
     (RemoveProjectCollaborator, Foreground),
     (RenameChannel, Foreground),
@@ -358,6 +360,7 @@ request_messages!(
     (ReloadBuffers, ReloadBuffersResponse),
     (RemoveChannelMember, Ack),
     (RemoveChannelMessage, Ack),
+    (UpdateChannelMessage, Ack),
     (RemoveContact, Ack),
     (RenameChannel, RenameChannelResponse),
     (RenameProjectEntry, ProjectEntryResponse),
@@ -442,7 +445,9 @@ entity_messages!(
 entity_messages!(
     {channel_id, Channel},
     ChannelMessageSent,
+    ChannelMessageUpdate,
     RemoveChannelMessage,
+    UpdateChannelMessage,
     UpdateChannelBuffer,
     UpdateChannelBufferCollaborators,
 );