import/export color field on front- and rear-ports for module-types and device-types

Closes: #9906

- Adds `color` field to front and rearport template import forms
- Adds `color` field to `to_yaml` export for front and rearport
  templates

netbox/dcim/models/device_component_templates.py

@@ -462,6 +462,7 @@ class FrontPortTemplate(ModularComponentTemplateModel):
         return {
             'name': self.name,
             'type': self.type,
+            'color': self.color,
             'rear_port': self.rear_port.name,
             'rear_port_position': self.rear_port_position,
             'label': self.label,
@@ -511,6 +512,7 @@ class RearPortTemplate(ModularComponentTemplateModel):
         return {
             'name': self.name,
             'type': self.type,
+            'color': self.color,
             'positions': self.positions,
             'label': self.label,
             'description': self.description,