Task#6 Add pagination

[Maslyna]

Add pagination

• Add pagination to the talent repository;
• Modify GET method /talents, he must accept next Request params:
  • Optional<Integer> page - this parameter indicates - the page number
  • Optional<Integer> size - this parameter indicates - how many elements the method returns

Need to be done before:

• Task#1 Create DB repository #10
• Task#2 Create Entities for DB #12