mgr/dashboard: Add 'network_mask' to nvmeof cli

mgr/dashboard: Add 'network_mask' to nvmeof cli

This commit add the following to nvmeof cli:
0. Add new param `--network-mask` to 'subsystem add' cmd
   It's a list parameter so we can pass multiple netmask by
   `subsystem add --network-mask <subnet1> --network-mask <subnet2>`
1. Add new cli `subsystem add_network --network-mask <subnet>`
2. Add new cli `subsystem del_network --network-mask <subnet>`
3. Add column 'network_mask' to `subsystem list` output
4. Add column 'manual' to `listener list` output

Fixes: https://tracker.ceph.com/issues/75348
Signed-off-by: Vallari Agrawal <vallari.agrawal@ibm.com>