feat: Support integer and byte slice value for SetNetwork()

[laeo]

With these changes, we can launch an Access Point by using wpa_supplicant.

conn.SetNetwork(0, "ssid", "test-access-point") // hex encoded ssid is not tested, hope someone can improve it.
conn.SetNetwork(0, "key_mgmt", "WPA-PSK")
conn.SetNetwork(0, "psk", "12345678")
conn.SetNetwork(0, "mode", 2) // we have to set mode to 2 without double quotes, so we need support integer value.
conn.SetNetwork(0, "frequency", 2414)
conn.EnableNetwork(0)

[laeo]

Because there are break changes, maybe we could provide another function like SetNetworkV2() for better compatibility.