feat(cli): json option for "deno info"

[implicitdef]

Hello
This PR implements #6260

Examples :
deno info --json

{
  "denoDir": "/Users/username/Library/Caches/deno",
  "modulesCache": "/Users/username/Library/Caches/deno/deps",
  "typescriptCache": "/Users/username/Library/Caches/deno/gen"
}

deno info --json https://deno.land/std/http/cookie.ts

{
  "local": "/Users/username/Library/Caches/deno/deps/https/deno.land/71cfa455a02c3c9eefb15d2f39d02d374ee9214eb8ece35364fd47d2ef0981d2",
  "file_type": "TypeScript",
  "compiled": "/Users/username/Library/Caches/deno/gen/https/deno.land/std/http/cookie.ts.js",
  "map": "/Users/username/Library/Caches/deno/gen/https/deno.land/std/http/cookie.ts.js.map",
  "deps": [
    "https://deno.land/std/http/cookie.ts",
    [
      [
        "https://deno.land/std/_util/assert.ts",
        []
      ],
      [
        "https://deno.land/std/datetime/mod.ts",
        [
          [
            "https://deno.land/std/_util/assert.ts",
            []
          ]
        ]
      ]
    ]
  ]
}

Compare to regular output :
deno info https://deno.land/std/http/cookie.ts

local: /Users/username/Library/Caches/deno/deps/https/deno.land/71cfa455a02c3c9eefb15d2f39d02d374ee9214eb8ece35364fd47d2ef0981d2
type: TypeScript
compiled: /Users/username/Library/Caches/deno/gen/https/deno.land/std/http/cookie.ts.js
map: /Users/username/Library/Caches/deno/gen/https/deno.land/std/http/cookie.ts.js.map
deps:
https://deno.land/std/http/cookie.ts
  ├── https://deno.land/std/_util/assert.ts
  └─┬ https://deno.land/std/datetime/mod.ts
    └── https://deno.land/std/_util/assert.ts

[CLAassistant]

All committers have signed the CLA.

[ry]

Looks good at first glance.

FYI this is a new feature and thus will have to wait until 1.2.0 lands - which will be July 13.

[ry]

Nice test

[bartlomieju]

Code looks good to me and I believe it's a very useful feature 👍 however I'm not sure about the JSON schema that is currently used, I'm pretty sure we'll iterate on it further.

So I suggest to require --unstable flag for deno info --json, so we can change the output before stabilizing this feature.

[qballer]

I'm waiting to test out this feature. Would really appreciate a merge on this.

[implicitdef]

I'll try to add the --unstable flag

[ry]

Nice work @implicitdef - LGTM