Implement working postgres driver

internal/storage/postgres/migrations/000001_initialize_schema.down.sql

@@ -0,0 +1,5 @@
+begin;
+
+drop table if exists "pastes";
+
+commit;

internal/storage/postgres/migrations/000001_initialize_schema.up.sql

@@ -0,0 +1,12 @@
+begin;
+
+create table if not exists "pastes" (
+    "id" text not null,
+    "content" text not null,
+    "deletionToken" text not null,
+    "created" bigint not null,
+    "autoDelete" boolean not null,
+    primary key ("id")
+);
+
+commit;