Give deno info a typescript api

[jingkaimori]

since command line execution could be dangerous, I suggest to add a typescript api to use deno info from application directly:

let infos = Deno.info("https://deno.land/[email protected]/http/file_server.ts")

for (i of infos.dependencies){
    console.log(i.url)
    console.log(i.size)
    for(j of i.dependencies){
        // ...
    }
}