pbr: T6430: Allow forwarding into VRFs by name as well as route table IDs

* PBR can only target table IDs up to 200 and the previous PR to extend the
  range was rejected
* PBR with this PR can now also target VRFs directly by name, working around
  targeting problems for VRF table IDs outside the overlapping 100-200 range
* Validation ensures rules can't target both a table ID and a VRF name
  (internally they are handled the same)
* Added a simple accessor (get_vrf_table_id) for runtime mapping a VRF name
  to table ID, based on vyos.ifconfig.interface._set_vrf_ct_zone().
  It does not replace that usage, as it deliberately does not handle non-VRF
  interface lookups (would fail with a KeyError).
* Added route table ID lookup dict, global route table and VRF table defs
  to vyos.defaults. Table ID references have been updated in code touched
  by this PR.
* Added a simple smoketest to validate 'set vrf' usage in PBR rules

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