feat: add shared connection capability

packages/backend/src/db/migrations/20230830100452_create_shared_connections.ts

@@ -0,0 +1,15 @@
+import { Knex } from 'knex';
+
+export async function up(knex: Knex): Promise<void> {
+  return knex.schema.createTable('shared_connections', (table) => {
+    table.uuid('id').primary().defaultTo(knex.raw('gen_random_uuid()'));
+    table.uuid('connection_id').notNullable().references('id').inTable('connections');
+    table.uuid('role_id').notNullable().references('id').inTable('roles');
+
+    table.timestamps(true, true);
+  });
+}
+
+export async function down(knex: Knex): Promise<void> {
+  return knex.schema.dropTable('shared_connections');
+}