"deno task" should support JSDoc as task description

[bartlomieju]

It would be tremendously helpful if we could support this:

// deno.jsonc
{
  "tasks": {
    // Run a dev server
    "dev": "deno run ...",

    // Generate a new subcommand
    "cmd:generate": "deno run ...",
    
    // Some other comment, Lorem ipsum dolor sit amet, consectetur adipiscing 
    // elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. 
    // Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi 
    // ut aliquip ex ea commodo consequat.
    "cmd:update": "deno run ...",
  }
}

Currently deno task would output:

Available tasks:
- dev
    deno run ...
- cmd:generate
    deno run ...
- cmd:update
    deno run ...

But it could output:

Available tasks:
- dev
    // Run a dev server
    deno run ...

- cmd:generate
    // Generate a new subcommand
    deno run ...

- cmd:update
    // Some other comment, Lorem ipsum dolor sit amet, consectetur adipiscing 
    // elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. 
    // Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi 
    // ut aliquip ex ea commodo consequat.
    deno run ...

This would make discoverability in new projects a lot better and make coming to an older project a breeze.

[dsherret]

Previous discussion on a similar proposal: #14949