feat: implement badges endpoint and sharing functionality

migrations/sqlite3/5_badges_column.sql

@@ -0,0 +1,11 @@
+-- +migrate Up
+-- SQL in section 'Up' is executed when this migration is applied
+
+alter table users
+    add column `badges_enabled` tinyint(1) default 0 not null;
+
+-- +migrate Down
+-- SQL section 'Down' is executed when this migration is rolled back
+
+alter table users
+    drop column `badges_enabled`;