Add reservation_affinity to node_pools config

[A-Bush]

TL;DR

Add possibility to create nodepools from specific reservation

Terraform Resources

https://cloud.google.com/kubernetes-engine/docs/how-to/consuming-reservations#specific
https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/container_cluster#nested_reservation_affinity

Detailed design

Add possibility to request specific reservations in nodepools like Hashicorp Terraform provider for Google Cloud
  
  node_config {
    machine_type = "e2-medium"

    reservation_affinity {
      consume_reservation_type = "SPECIFIC_RESERVATION"
      key                      = "compute.googleapis.com/reservation-name"
      values                   = [google_compute_reservation.specific_reservation.name]
    }
  }

### Additional information

_No response_

[song-william]

This would help our project as well! Our nodes require capacity reservations to be hit.

[DrFaust92]

Ill try to take a look at this in the upcoming week