Add DynEq trait for VortexExpr and implement PartialEq for VortexExpr… #1284

Job	Run time
clickbench	15m 14s
bench (datafusion, DataFusion)	4m 17s
commit-metadata	12s
bench (random_access, Random Access)	2m 31s
tpch	10m 53s
bench (compress, Vortex Compression)	39m 44s
	1h 12m 51s

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