Implemented user event listeners

src/main/resources/db/migration/V1__initial.sql

@@ -0,0 +1,12 @@
+CREATE TABLE IF NOT EXISTS connections_user (
+    id BIGINT PRIMARY KEY,
+    first_name VARCHAR(255) NOT NULL,
+    last_name VARCHAR(255) NOT NULL,
+    email VARCHAR(255) NOT NULL,
+    avatar_url VARCHAR(255) NOT NULL,
+    is_active BOOLEAN NOT NULL,
+    is_onboarded BOOLEAN NOT NULL,
+    is_email_verified BOOLEAN NOT NULL,
+    headline VARCHAR(255) NOT NULL,
+    version BIGINT NOT NULL
+);