update deno and oak versions and using postgresjs

[PanovYury]

I suggest my own version of fixing the oak framework. It's interesting to look at the tests for this framework, so I have made some changes:

1. Updated deno to version 2.3.1. This version includes optimizations for Deno serve
2. Updated oak to the latest version.
3. Replaced cotton with postgresjs. Cotton was last updated 4 years ago and does not work with Deno 2.
4. Created a deno.json file instead of deps.ts.
5. Use deno install --entrypoint instead of cache. deno cache has been deprecated.
6. Use deno serve with --parallel flag. This is used in Deno tests already
7. Split configurations like other frameworks: only oak and oak + postgresjs

P.s. Code for postgresjs copied from fastify.

Verification tests works localy