feat: add contact repository and base repository for shared db logic

internal/repository/interfaces.go

@@ -0,0 +1,8 @@
+package repository
+
+type Repository[T any] interface {
+	BuildQuery(s string) string
+	GetByID(id int) (*T, error)
+	GetAll() ([]T, error)
+	Delete(id int) error
+}