Allow for source and destination ports within a ServiceObject

[trdelmus]

Environment

• Nautobot version:
• nautobot-firewall-models version:

Proposed Functionality

The ServiceObject model should allow for both source and destination ports or have a direction identifier.

Use Case

Every firewall I've worked with defines a Service as including both source and destination ports. This creates problems when mapping from and to firewall vendors as Nautobot ServiceObjects are ambiguous in their definition.

With my understanding of the current implementation, I would need to create multiple ServiceObjects and distinguish them by name.