The default chunk size in the partition was set to 100000. It could be
overridden as a larger or smaller number, but not disabled altogether.
This change adds the ability for users to explicitly opt out of the
limit by specifying a negative number or zero. The default behavior is
the same.
Filtering and sorting needs to operate on unstructured data. It also
needs to operate after the parallel partitioner, higher in the store
stack. This means that the proxy Store needs to return raw, unstructured
data up to the partitioner. This change moves all conversions from
unstructured Kubernetes types to apiserver objects up from the proxy
store into the partitioner.
