Fix organization cmd, support json/md flags

[pvdz]

• Sorted a plurality inconsistency in the organization command.
• Made it support the --json and --markdown and --dry-run flags.
• Will no longer print your full api key to stdout.
• Added to the dry-run tests

$ npm exec socket -- organization
List of organizations associated with your API key, ending with: K1E9tD

- Name: SocketDev, ID: 1381, Plan: enterprise

$ npm exec socket -- organization --json
[
  {
    "name": "SocketDev",
    "id": "1381",
    "plan": "enterprise"
  }
]

$ npm exec socket -- organization --markdown
# Organizations

List of organizations associated with your API key, ending with: K1E9tD

| Name      | ID   | Plan       |
| --------- | ---- | ---------- |
| SocketDev | 1381 | enterprise |
| --------- | ---- | ---------- |

This works including to the point where you can capture the output to a file (the spinner writes to stderr).