Adds a move_chunk function which to a different tablespace. This is
implemented as an extension to the reorder command.
Given that the heap, toast tables, and indexes are being rewritten
during the reorder operation, adding the ability to modify the tablespace
is relatively simple and mostly requires adding parameters to the relevant
functions for the destination tablespace (and index tablespace). The tests
do not focus on further exercising the reorder infrastructure, but instead
ensure that tablespace movement and permissions checks properly occur.
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