implement a query engine for liveview

packages/liveview/Cargo.toml

@@ -14,6 +14,8 @@ license = "MIT/Apache-2.0"
 
 [dependencies]
 thiserror = "1.0.38"
+log = "0.4.14"
+slab = "0.4"
 futures-util = { version = "0.3.25", default-features = false, features = [
     "sink",
 ] }