refactor: IntDecoder #15493

Job	Run time
Build	49m 59s
Build with Clang	0s
Spark Aggregate Fuzzer	15m 43s
Presto Fuzzer	15m 43s
Spark Fuzzer	49m 8s
Exchange Fuzzer	16m 23s
Presto Bias Fuzzer	0s
Join Fuzzer	17m 31s
RowNumber Fuzzer	15m 35s
Spark Bias Fuzzer	0s
Cache Fuzzer	15m 41s
Aggregation Fuzzer with Presto as source of truth	17m 30s
Biased Expression Fuzzer with Only Added/Updated Functions and Presto as source of truth	0s
Window Fuzzer with Presto as source of truth	18m 1s
Signature Changes	2s
Biased Aggregation Fuzzer with Presto as source of truth	0s
Writer Fuzzer with Presto as source of truth	17m 23s
	4h 8m 39s

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