Ability to observe number of compressed, rejected and bypassed blocks as the benchmark progress

[shubhajeet]

Summary:
For some use-case we may want to observe certain parameter as the benchmarking experiment progress to verify something. We added ability to observe NUMBER_OF_BLOCK_COMPRESSED, NUMBER_OF_BLOCKS_REJECTED, NUMBER_OF_BLOCKS_BYPASSED.

TestPlan:
Run the following benchmark script to observe the above 3 stats are being printed.

./db_bench --db=/dev/shm/dbbench --benchmarks=fillseq —-num=10000000 --compaction_style=2 --fifo_compaction_max_table_files_size_mb=1000 --fifo_compaction_allow_compaction=0 --disable_wal --write_buffer_size=12000000 --compression_type=zstd --compression_parallel_threads=1 --compression_manager=none --same_value_percentage=0 --stats_level=5 —-statistics --stats_interval=1 --stats_per_interval=1