BE: Handle pagination request from frontend

[khangttse182098]

• Description: After receive pagination request, backend need to return the amount of data (50 products) by page

• Approval standards:

  • Handle pagination request correctly
  • Return the correct number of products according to request

• Reason for the estimated point:

  • No experience doing this

• Solution:

  • Learn & use pagination in backend

[nnh53]

• Move to sprint 3