T5497: op-mode: Add generate firewall rule-resequence

Add op-mode command generate firewall rule-resequence
Generates output with new sequences for firewall rules

set firewall ipv4 input filter rule 1 action 'accept'
set firewall ipv4 input filter rule 1 description 'Allow loopback'

$ generate firewall rule-resequence start 10 step 10

set firewall ipv4 input filter rule 10 action 'accept'
set firewall ipv4 input filter rule 10 description 'Allow loopback'