wasmtime: add CLI options for pre-opened TCP listen sockets (#3729)

This patch  implements CLI options to insert pre-opened sockets.

`--listenfd` : Inherit environment variables and file descriptors following
               the systemd listen fd specification (UNIX only).

`--tcplisten <SOCKET ADDRESS>`: Grant access to the given TCP listen socket.

Signed-off-by: Harald Hoyer <harald@profian.com>

Cargo.toml

@@ -39,6 +39,7 @@ rayon = "1.5.0"
 humantime = "2.0.0"
 wasmparser = "0.82.0"
 lazy_static = "1.4.0"
+listenfd = "0.3.5"
 
 [target.'cfg(unix)'.dependencies]
 rustix = "0.33.0"