Added Login and Register handlers for actix backend

backend-actix/migrations/2022-03-19-191822_initial/down.sql

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+-- This file should undo anything in `up.sql`
+
+drop table gamenight;
+drop table known_games;

backend-actix/migrations/2022-03-19-191822_initial/up.sql

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+-- Your SQL goes here
+
+CREATE TABLE gamenight (
+    id UUID NOT NULL PRIMARY KEY,
+    name VARCHAR NOT NULL,
+    datetime VARCHAR NOT NULL
+);
+
+CREATE TABLE known_games (
+    id UUID NOT NULL PRIMARY KEY,
+    name VARCHAR UNIQUE NOT NULL
+);