feat: Support json output format on argo lint Fixes #14035

[pakio]

Fixes #14035

Motivation

Add new output format, json, to enable easier post-processing of lint result.

Modifications

• Added new formatter : formatter_json
• Updated argo lint to allow --output json

Verification

Tested with locally built cli

$ make cli
$ ./dist/argo lint --output json ./examples/*.yaml --offline | jq .

{
  "results": [
    {
      "file": "./examples/archive-location.yaml",
      "errors": [],
      "linted": true
    },
    ...
    {
      "file": "./examples/workflow-of-workflows.yaml",
      "errors": [],
      "linted": true
    }
  ],
  "success": false,
  "anything_linted": true
}

[tczhao]

Looks good, very clean