resource(switch_port_settings): update implementation

This patch made the following changes.

* Renamed the resource from `oxide_switch_port_configuration` to
`oxide_switch_port_settings` to be consistent with the upstream API.

* Changed the schema to reflect the schema from the
`networking_switch_port_settings_create` API. Further
work is required to account for the schema returned by the
`networking_switch_port_settings_view` API.

* Created new functions to convert to and from Terraform models to Oxide
models.

Author: sudomateo

internal/provider/provider.go

@@ -199,6 +199,6 @@ func (p *oxideProvider) Resources(_ context.Context) []func() resource.Resource
 		NewVPCSubnetResource,
 		NewFloatingIPResource,
 		NewSiloResource,
-		NewSwitchPortConfigurationResource,
+		NewSwitchPortSettingsResource,
 	}
 }