[4.4.0] option for connection limiting is missing on the rich_rule

[tuxmaster5000]

When editing the zone file by hand, this will be valid:

<accept>
<limit value="10/s" />
</accpet>

For example to allow only 10 connections per second. But there is no way to set this in the current version.
Here the documentation about this feature:
https://firewalld.org/documentation/man-pages/firewalld.richlanguage.html