BE rest and mono validation middleware

[KazbekSungurov]

3 sp
Add middleware to handlers for data validation. MONO and REST
For TT:
Monolith:
Login now checks data :

1. email - is email, empty, SQL
2. password - empty, SQL, len 5-25
   Rest:
   Login now checks data :
3. email - is email, empty, SQL
4. password - empty, SQL, len 5-25
5. If user already logged in (JWT token in Headers)
   Registration:
6. All users field (info in Postman doc.)