feat(measurement): add IRTT engine

Cargo.toml

@@ -25,6 +25,7 @@ csv = "1.4.0"
 fastrand = "2"
 flume = { version = "0.12.0",  default-features = false, features = ["async", "eventual-fairness", "select"] }
 icmp-socket2 = { version = "0.6.4", features = ["tokio"] }
+irtt-client = { version = "0.6.0", optional = true, features = ["ancillary", "tokio"] }
 libc = "0.2"
 rustix = { version = "1.1", features = ["fs", "system", "thread", "time"] }
 serde = { version = "1", features = ["derive"] }
@@ -44,7 +45,8 @@ netlink-socket2 = { version = "0.3.5" }
 rust-uci = { git = "https://github.com/Lochnair/rust-uci.git", rev = "6835397f4f4ba8b69e75e727105186865c357417", optional = true, default-features = false }
 
 [features]
-default = ["toml", "uci-vendored"]
+default = ["irtt", "toml", "uci-vendored"]
+irtt = ["dep:irtt-client"]
 toml = ["config/toml"]
 uci = ["dep:rust-uci"]
 uci-vendored = ["uci", "rust-uci/vendored"]