Format and lint manually with deno

[tcely]

Lint results:

error[no-prototype-builtins]: Access to Object.prototype.hasOwnProperty is not allowed from target object
  --> /tmp/github/yt-cipher/src/validation.ts:28:14
   |
28 |         if (!obj.hasOwnProperty(key) || !schema[key](obj[key])) {
   |              ^^^^^^^^^^^^^^^^^^^^^^^                                                                                                                

  docs: https://docs.deno.com/lint/rules/no-prototype-builtins


error[require-await]: Async arrow function has no 'await' expression or 'await using' declaration.
  --> /tmp/github/yt-cipher/src/validation.ts:36:12
   |
36 |     return async (ctx: RequestContext) => {
   |            ^^^^^
   = hint: Remove 'async' keyword from the function or use 'await' expression or 'await using' declaration inside.

  docs: https://docs.deno.com/lint/rules/require-await

[tcely]

Incorporated into #18