Enabled Zipfian key distribution for arbitrary commands. #314
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This PR adds support for the Zipfian (Z) key access pattern to arbitrary commands in memtier_benchmark.
Updates the CLI argument parsing and validation logic to accept Z as a valid key pattern, ensures proper initialization of Zipf-related parameters when used in either global or per-command configurations
Introduces test coverage for Zipfian access patterns across various arbitrary commands (SET, GET, HSET, etc.).