Add callback in TableAmRoutine to handle swapping relation files

[gfphoenix78]

Custom table access method may have internal auxiliary relatioins on how to access tuples, like segfile/visimap/block directory in AO/CO tables. The kernel only handles swapping objects for standard heap table:

1. swap entries in pg_class
2. swap optional toast tables

The internal auxiliary relations keep the old structure for the new table, which is definitely wrong.
This commit adds a new callback to swap the internal auxiliary relations for AO/CO and custom table AM.

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