feat: Add API to return function signatures by name #17535

Job	Run time
Build	23m 55s
Build with Clang	0s
Spark Aggregate Fuzzer	15m 40s
Presto Fuzzer	15m 44s
Exchange Fuzzer	15m 48s
Presto Bias Fuzzer	0s
Join Fuzzer	17m 5s
RowNumber Fuzzer	15m 33s
Spark Bias Fuzzer	0s
Spark Fuzzer	15m 42s
Cache Fuzzer	16m 13s
Memory Arbitration Fuzzer	17m 55s
Aggregation Fuzzer with Presto as source of truth	17m 22s
Window Fuzzer with Presto as source of truth	17m 20s
Writer Fuzzer with Presto as source of truth	17m 12s
Signature Changes	4s
Table Evolution Fuzzer	15m 33s
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
	3h 41m 6s

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