Backend endpoints handlers

[yaqootturman]

• fetchMedicinsDescription Handler
  fetch

• listPharmacies Handler
  use getPharmacies() query to get all pharmacies contain medicine

• login Handler
  Hash password
  compare password and user with data by checkAuth handler
  Set cookies

• getMedicine Handler
  get medicine info in specific pharmacy by getMedicine() query

• updateMedicine Handler
  PATCH data by updateMedicine() query

• PostMedicine Handler
  check of medicine exist or not from external api
  check if medicine exits in medicine table, if it doesnt then
  use postMedicine() query to post data to medicine table
  then post to the medicine_to_pharmacy table using the medicineToPharmacy() query

• checkAuth Handler
  check cookies exist or not