feat(utils): Support non-exe commands on Windows (#2019)

Have added support to the `utils::exec_cmd` to allow it to execute
commands that are not `.exe` on Windows. Have also added a timer to
measure how long a command took to execute.

Cargo.toml

@@ -63,6 +63,7 @@ serde = { version = "1.0.118", features = ["derive"] }
 indexmap = "1.6.1"
 notify-rust = { version = "4.0.0", optional = true }
 semver = "0.11.0"
+which = "4.0.2"
 
 # Optional/http:
 attohttpc = { version = "0.16.0", optional = true, default-features = false, features = ["tls", "form"] }