perf(utils): Add timeout to utils::exec_cmd (#2171)

* perf(utils): Add timeout to `utils::exec_cmd`

This adds a timeout to any command executed using the `utils::exec_cmd`.
The initial time limit is hard coded to 500ms but if required we can
make this configurable. Have also switched the tests to be a bit more
granular on which systems they are ignored.

* Terminate the processes if they timeout

Cargo.toml

@@ -64,6 +64,7 @@ indexmap = "1.6.1"
 notify-rust = { version = "4.2.2", optional = true }
 semver = "0.11.0"
 which = "4.0.2"
+process_control = { version = "3.0.0", features = ["crossbeam-channel"] }
 
 # Optional/http:
 attohttpc = { version = "0.16.1", optional = true, default-features = false, features = ["tls", "form"] }