Add buffer integration test

Rearrange channel crate structure
Get channel buffer from database

co-authored-by: Max <max@zed.dev>

crates/call/Cargo.toml

@@ -20,6 +20,7 @@ test-support = [
 
 [dependencies]
 audio = { path = "../audio" }
+channel = { path = "../channel" }
 client = { path = "../client" }
 collections = { path = "../collections" }
 gpui = { path = "../gpui" }

crates/call/src/call.rs

@@ -7,9 +7,8 @@ use std::sync::Arc;
 use anyhow::{anyhow, Result};
 use audio::Audio;
 use call_settings::CallSettings;
-use client::{
-    proto, ChannelId, ClickhouseEvent, Client, TelemetrySettings, TypedEnvelope, User, UserStore,
-};
+use channel::ChannelId;
+use client::{proto, ClickhouseEvent, Client, TelemetrySettings, TypedEnvelope, User, UserStore};
 use collections::HashSet;
 use futures::{future::Shared, FutureExt};
 use postage::watch;