Namespace to Gateway - Create minimal `basic-service` template for Gateways Get Started

[rustyjux]

Create an ultra simplistic gw-config template for a users first time using the Portal.

Should:

• be compatible with gwa apply

Something like this:

services:
 - url: https://httpbin.org
   tags: [ ns.gw-abc123 ]
   name: rjv-example-service
   routes:
     - hosts: 
         - rjv-example-service.api.gov.bc.ca
       name: base
       tags: [ ns.gw-abc123 ]

Should also:

• include a Product, ProductEnvironment, DraftDataset - draft dataset should use the template for API Directory listings (https://dpdd.atlassian.net/issues/APS-2598)
• use the same conventions as other templates to append -dev onto service names