add option to configure destination cidr in egress firewall rules

[Curverneur]

Description

This PR introduces support for configuring a destination network in outgoing firewall rules, a feature introduced in API v4.10. The change is backward-compatible and not a breaking change, allowing users to optionally specify dest_cidr_list in their configuration.

References

API: https://cloudstack.apache.org/api/apidocs-4.22/apis/createEgressFirewallRule.html

Changes

Added dest_cidr_list option to the rules block of cloudstack_egress_firewall and updated the documentation page accordingly.

• modified cloudstack/resource_cloudstack_egress_firewall.go
• modified website/docs/r/egress_firewall.html.markdown