refactor log

libs/hbb_common/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+flexi_logger = { version = "0.22", features = ["async", "use_chrono_for_offset"] }
 protobuf = { version = "3.1", features = ["with-bytes"] }
 tokio = { version = "1.20", features = ["full"] }
 tokio-util = { version = "0.7", features = ["full"] }