feat: Optimize PrestoBatchVectorSerializer [1/7]: Serialize FlatVectors #16225

Job	Run time
Build	10m 35s
Build with Clang	0s
Spark Aggregate Fuzzer	0s
Spark Bias Fuzzer	0s
Presto Bias Fuzzer	0s
Exchange Fuzzer	0s
Presto Fuzzer	0s
Cache Fuzzer	0s
Aggregation Fuzzer with Presto as source of truth	0s
RowNumber Fuzzer	0s
Spark Fuzzer	0s
Join Fuzzer	0s
Biased Aggregation Fuzzer with Presto as source of truth	0s
Biased Expression Fuzzer with Only Added/Updated Functions and Presto as source of truth	0s
Window Fuzzer with Presto as source of truth	0s
Writer Fuzzer with Presto as source of truth	0s
Signature Changes	0s
	10m 35s

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