channel projects (#8456)

Add plumbing for hosted projects. This will currently show them if they
exist
but provides no UX to create/rename/delete them.

Also changed the `ChannelId` type to not auto-cast to u64; this avoids
type
confusion if you have multiple id types.


Release Notes:

- N/A

crates/call/src/call.rs

@@ -5,7 +5,7 @@ pub mod room;
 use anyhow::{anyhow, Result};
 use audio::Audio;
 use call_settings::CallSettings;
-use client::{proto, Client, TypedEnvelope, User, UserStore, ZED_ALWAYS_ACTIVE};
+use client::{proto, ChannelId, Client, TypedEnvelope, User, UserStore, ZED_ALWAYS_ACTIVE};
 use collections::HashSet;
 use futures::{channel::oneshot, future::Shared, Future, FutureExt};
 use gpui::{
@@ -107,7 +107,7 @@ impl ActiveCall {
         }
     }
 
-    pub fn channel_id(&self, cx: &AppContext) -> Option<u64> {
+    pub fn channel_id(&self, cx: &AppContext) -> Option<ChannelId> {
         self.room()?.read(cx).channel_id()
     }
 
@@ -336,7 +336,7 @@ impl ActiveCall {
 
     pub fn join_channel(
         &mut self,
-        channel_id: u64,
+        channel_id: ChannelId,
         cx: &mut ModelContext<Self>,
     ) -> Task<Result<Option<Model<Room>>>> {
         if let Some(room) = self.room().cloned() {
@@ -487,7 +487,7 @@ impl ActiveCall {
 pub fn report_call_event_for_room(
     operation: &'static str,
     room_id: u64,
-    channel_id: Option<u64>,
+    channel_id: Option<ChannelId>,
     client: &Arc<Client>,
 ) {
     let telemetry = client.telemetry();
@@ -497,7 +497,7 @@ pub fn report_call_event_for_room(
 
 pub fn report_call_event_for_channel(
     operation: &'static str,
-    channel_id: u64,
+    channel_id: ChannelId,
     client: &Arc<Client>,
     cx: &AppContext,
 ) {