[BUG] firewalld: unable to enable/disable intra-zone forwarding

[rombert]

Description
firewall-cmd has support for configuring intra-zone forwarding, see https://firewalld.org/documentation/man-pages/firewall-cmd.html and https://firewalld.org/2020/04/intra-zone-forwarding .

[--permanent] [--zone=zone] --add-forward
        Enable intra zone forwarding. 

[--permanent] [--zone=zone] --remove-forward
        Disable intra zone forwarding. 

This is currently not configurable via the salt modules and states.

Setup

None needed.

Steps to Reproduce the behavior

None needed, impossible to set the forward attribute via the salt module or state.

Expected behavior

Allow to configure intra-zone forwarding with the state/module.

Screenshots

None needed.

Versions Report

Not applicable

Additional context

None.