Add the ability to reply to a message (#7170)

Feature
- [x] Allow to click on reply to go to the real message
    - [x] In chat
- [x] Show only a part of the message that you reply to
    - [x] In chat
    - [x] In reply preview

TODO’s
- [x] Fix migration
    - [x] timestamp(in filename)
    - [x] remove the reference to the reply_message_id
- [x] Fix markdown cache for reply message
- [x] Fix spacing when first message is a reply to you and you want to
reply to that message.
- [x] Fetch message that you replied to
    - [x] allow fetching messages that are not inside the current view 
- [x] When message is deleted, we should show a text like `message
deleted` or something
    - [x] Show correct GitHub username + icon after `Replied to: `
    - [x] Show correct message(now it's hard-coded)
- [x] Add icon to reply + add the onClick logic
- [x] Show message that you want to reply to
  - [x] Allow to click away the message that you want to reply to
  - [x] Fix hard-coded GitHub user + icon after `Reply tp:`
  - [x] Add tests

<img width="242" alt="Screenshot 2024-02-06 at 20 51 40"
src="https://github.com/zed-industries/zed/assets/62463826/a7a5f3e0-dee3-4d38-95db-258b169e4498">
<img width="240" alt="Screenshot 2024-02-06 at 20 52 02"
src="https://github.com/zed-industries/zed/assets/62463826/3e136de3-4135-4c07-bd43-30089b677c0a">


Release Notes:

- Added the ability to reply to a message.
- Added highlight message when you click on mention notifications or a
reply message.

---------

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

crates/collab/src/rpc.rs

@@ -3019,6 +3019,10 @@ async fn send_channel_message(
             &request.mentions,
             timestamp,
             nonce.clone().into(),
+            match request.reply_to_message_id {
+                Some(reply_to_message_id) => Some(MessageId::from_proto(reply_to_message_id)),
+                None => None,
+            },
         )
         .await?;
     let message = proto::ChannelMessage {
@@ -3028,6 +3032,7 @@ async fn send_channel_message(
         mentions: request.mentions,
         timestamp: timestamp.unix_timestamp() as u64,
         nonce: Some(nonce),
+        reply_to_message_id: request.reply_to_message_id,
     };
     broadcast(
         Some(session.connection_id),