Move SQL test files

src/test/resources/sql/fixtures/1-fixture_user.sql

@@ -0,0 +1,18 @@
+create or replace function fixture_user(in name text default 'george', out user_id uuid)
+    language plpgsql as
+$$
+declare
+    created_user json;
+begin
+    if (name = 'george') then
+        created_user = '{"username": "george", "password": "azerty", "roles": ["ROLE_USER"]}';
+    elseif (name = 'john') then
+        created_user = '{"username": "john", "password": "qwerty", "roles": ["ROLE_USER"]}';
+    elseif (name = 'tesla') then
+        created_user = '{"username": "tesla", "password": "azerty", "roles": ["ROLE_USER"]}';
+    end if;
+
+    select insert_user(created_user) into created_user;
+    user_id := created_user->>'id';
+end
+$$;