Only persist certain stats when serializing arrays in FlatLayout (#1984) #1382

Job	Run time
bench (datafusion, DataFusion)	4m 22s
clickbench	14m 5s
bench (random_access, Random Access)	5m 44s
bench (compress, Vortex Compression)	38m 56s
commit-metadata	12s
tpch	5m 31s
	1h 8m 50s

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