Added Login and Register handlers for actix backend

backend-actix/migrations/2022-05-27-183310_gamenight_gamelist/down.sql

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

backend-actix/migrations/2022-05-27-183310_gamenight_gamelist/up.sql

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+-- Your SQL goes here
+
+create table gamenight_gamelist (
+    gamenight_id UUID NOT NULL,
+    game_id UUID NOT NULL,
+    CONSTRAINT FK_gamenight_id FOREIGN KEY (gamenight_id) REFERENCES gamenight(id) ON DELETE CASCADE,
+    CONSTRAINT FK_game_id FOREIGN KEY (game_id) REFERENCES known_games(id) ON DELETE CASCADE,
+    PRIMARY KEY(gamenight_id, game_id)
+);