wip: Chore/templates

reserve a domain names

• add a reserved subdomains model, linked to a user (user, endsWith)
• add a graphql query:

query checksubdomain {
  checkSubdomain(subdomain:"hello.demo") {
  available
  }
}

Exemple:

• me (hello@voca.city) have a reserved subdomain ".demo"
• the frontend asks the back about hello.demo for another user, will returns false.
• the frontend asks the back about hello.demo for me, will returns true.

templates

• add a Query.templates
• add a privateTo field to be able to select templates exclusivity for a user
• add a policy to be transparent to the frontend
• fields:

• title: template title
• templateName: template identifier to pass to instance creation
• description: template description
• version: some indication on maturity, internals only for now
• supportedLocalesCSV: a comma-separated value of supported locales. ex: fr,fr-CA,fr-CH,en,en-GB,en-US
• privateTo the user the template is private. Always return or null or the current user.

query listTemplates {
  templates (filters:{privateTo:null }) {
  	data{
      attributes{
        title
        templateName
        description
        version
        supportedLocalesCSV
        privateTo { 
        	data {
            id
          }
        }
      }
    }
  }
}