[Opt] (multi-catalog) Opt split assignment to resolve uneven distribution. Currently only for `FileQueryScanNode`.
Referring to the implementation of Trino,
- Local node soft affinity optimization. Prefer local replication node.
- Remote split will use the consistent hash algorithm is used when the file cache is turned on, and because of the possible unevenness of the consistent hash, the split is re-adjusted so that the maximum and minimum split numbers of hosts differ by at most `max_split_num_variance` split.
- Remote split will use the round-robin algorithm is used when the file cache is turned off.
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