gayyappan 4f865f7870 Add recompress_chunk function
After inserts go into a compressed chunk, the chunk is marked as
unordered.This PR adds a new function recompress_chunk that
compresses the data and sets the status back to compressed. Further
optimizations for this function are planned but not part of this PR.

This function can be invoked by calling
SELECT recompress_chunk(<chunk_name>).

recompress_chunk function is automatically invoked by the compression
policy job, when it sees that a chunk is in unordered state.
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