Add buffer integration test

Rearrange channel crate structure
Get channel buffer from database

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

Cargo.lock

@@ -1063,6 +1063,7 @@ dependencies = [
  "anyhow",
  "async-broadcast",
  "audio",
+ "channel",
  "client",
  "collections",
  "fs",
@@ -1190,6 +1191,41 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "channel"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "client",
+ "collections",
+ "db",
+ "futures 0.3.28",
+ "gpui",
+ "image",
+ "language",
+ "lazy_static",
+ "log",
+ "parking_lot 0.11.2",
+ "postage",
+ "rand 0.8.5",
+ "rpc",
+ "schemars",
+ "serde",
+ "serde_derive",
+ "settings",
+ "smol",
+ "staff_mode",
+ "sum_tree",
+ "tempfile",
+ "text",
+ "thiserror",
+ "time 0.3.24",
+ "tiny_http",
+ "url",
+ "util",
+ "uuid 1.4.1",
+]
+
 [[package]]
 name = "chrono"
 version = "0.4.26"
@@ -1354,6 +1390,7 @@ dependencies = [
  "staff_mode",
  "sum_tree",
  "tempfile",
+ "text",
  "thiserror",
  "time 0.3.24",
  "tiny_http",
@@ -1418,6 +1455,7 @@ dependencies = [
  "axum-extra",
  "base64 0.13.1",
  "call",
+ "channel",
  "clap 3.2.25",
  "client",
  "collections",
@@ -1480,6 +1518,7 @@ dependencies = [
  "anyhow",
  "auto_update",
  "call",
+ "channel",
  "client",
  "clock",
  "collections",
@@ -9536,6 +9575,7 @@ dependencies = [
  "async-recursion 1.0.4",
  "bincode",
  "call",
+ "channel",
  "client",
  "collections",
  "context_menu",
@@ -9661,6 +9701,7 @@ dependencies = [
  "backtrace",
  "breadcrumbs",
  "call",
+ "channel",
  "chrono",
  "cli",
  "client",