NubesGen is easily extensible

[cmaneu]

User stories

• [ ] Adding new Azure Services should be easy
• [ ] Changing some default configuration should be possible/easy
• [ ] #365

[cmaneu]

FYI, .NET Templates have a new "constraints" mechanism.

"constraints": {
       "web-assembly": {
           "type": "workload",
           "args": "wasm-tools"
       },
   }