Create Initial Database Schema for Tasks. (#1)

Create migration scripts for this and initial Task DB Model in rust along with unit tests.

Reviewed-on: #1
Co-authored-by: Drew Galbraith <drew@tiramisu.one>
Co-committed-by: Drew Galbraith <drew@tiramisu.one>

backend/src/main.rs

@@ -1,5 +1,8 @@
 use axum::{Router, routing::get};
 
+mod models;
+mod database;
+
 #[tokio::main]
 async fn main() {
     tracing_subscriber::fmt::init();