Set buffer time before/after event type (#2015)

* before and after buffer added to handleAvailableSlots function

* --WIP

* added migration

* pull buffer data from DB

* cleanup

* added buffer input in form

* removed unused functions in controller field

* improved the buffer time check

* fixed default value and added preceding event afterbuffer consideration

* fixed e2e test issue

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

packages/prisma/schema.prisma

@@ -59,6 +59,8 @@ model EventType {
   requiresConfirmation    Boolean                @default(false)
   disableGuests           Boolean                @default(false)
   minimumBookingNotice    Int                    @default(120)
+  beforeEventBuffer       Int                    @default(0)
+  afterEventBuffer        Int                    @default(0)
   schedulingType          SchedulingType?
   Schedule                Schedule[]
   price                   Int                    @default(0)