Ethernet MAC address can set as a static(fixed) address

**Is your feature request related to a problem? Please describe.**
This is a new feature,which not present now.

**Describe the solution you'd like**
Like raw ubuntu, or other Linux.Mac address can be set to a static value,use command "sudo ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx"

**Describe alternatives you've considered**
No

**Additional context**
In some cases,router configed only transfer eth-packet from the machine who's mac in white list.However, eth-mac changed everytime after system reboot.

Start by comparing WSL's current Ethernet initialization with Linux's ifconfig hw ether behavior and trace where the interface MAC is assigned during reboot. Define how a user-specified fixed MAC would be configured and persisted, then verify that the address remains unchanged after restart and supports the stated whitelist scenario.

Written by the indexing model from the issue text.