Update array handling in Provable.toFields #4393

Job	Run time
Prepare	1m 8s
Build-And-Test-Web	3m 56s
Run unit tests parallel (1)	59s
Run unit tests parallel (2)	27m 44s
Build-And-Test-Server (Simple integration tests)	44m 44s
Run unit tests parallel (3)	5m 54s
Build-And-Test-Server (Reducer integration tests)	15m 34s
Build-And-Test-Server (DEX integration tests)	17m 45s
Run unit tests parallel (4)	20m 15s
Build-And-Test-Server (DEX integration test with proofs)	17m 5s
Run unit tests parallel (5)	13m 24s
Build-And-Test-Server (Voting integration tests)	6m 27s
Build-And-Test-Server (Verification Key Regression Check)	1h 6m 51s
Run unit tests parallel (6)	8m 51s
Build-And-Test-Server (CommonJS test)	1m 42s
Run unit tests parallel (7)	14m 47s
Run unit tests parallel (8)	2m 29s
Build-And-Test-Server (Unit tests)	1s
Release-mina-signer-on-NPM	0s
Release-on-NPM	0s
	4h 29m 36s

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