feat(functions): add initial describe cmd

[fmiamoto]

What

Implement initial describe cmd

$ bin/azioncli edge_functions describe 3770 --with-code
ID: 3770
Name: HelloFunc
Language: javascript
Reference Count: 2
Modified at: 2022-01-10T19:46:11.559337Z
Initiator Type: edge_application
Last Editor: fsmiamoto@gmail.com
Function to run:
JSON Args: {"a":"b","c":"d"}
Code:
async function handleRequest(request) {
 return new Response("Hello World!!",
   {
       status:204
   })
}
addEventListener("fetch", event => {
 event.respondWith(handleRequest(event.request))
})

Why

https://aziontech.atlassian.net/browse/ENG-18861