Added Login and Register handlers for actix backend

backend-actix/migrations/2022-05-14-104118_gamenight_owners/down.sql

@@ -0,0 +1,4 @@
+-- This file should undo anything in `up.sql`
+
+ALTER TABLE gamenight
+DROP COLUMN owner_id;

backend-actix/migrations/2022-05-14-104118_gamenight_owners/up.sql

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+ALTER TABLE gamenight RENAME TO _gamenight_old;
+
+CREATE TABLE gamenight (
+    id UUID NOT NULL PRIMARY KEY,
+    name VARCHAR NOT NULL,
+    datetime VARCHAR NOT NULL,
+    owner_id UUID NOT NULL,
+    CONSTRAINT FK_OwnerId FOREIGN KEY (owner_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+SET session_replication_role = 'replica';
+
+INSERT INTO gamenight (id, name, datetime, owner_id)
+select id, name, datetime, '00000000-0000-0000-0000-000000000000'
+FROM _gamenight_old;
+
+drop table _gamenight_old;
+
+SET session_replication_role = 'origin';