[FEATURE] Add Miimon linux bonding metrics

[JustHumanz]

Add :

# HELP node_bonding_miimon MII link monitoring frequency in milliseconds.
# TYPE node_bonding_miimon gauge
node_bonding_miimon{master="bond0"} 200

From

/sys/class/net/<bonding>/bonding/miimon

pr context:

• https://github.com/prometheus/node_exporter/issues/3319