[zkLogin] Check that bigints fit into the field for extra safety

[mskd12]

Description

Turns out we don't check anywhere that the inputs fit into the field and neither does the poseidon-lite library (it just truncates elements and fits them into the field).

Instrumenting poseidon seems like the simplest way to do this. The other option (which I have not taken) is to instrument as soon as we receive some inputs..

Test Plan

How did you test the new or updated feature?

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Type of Change (Check all that apply)

• [ ] protocol change
• [ ] user-visible impact
• [ ] breaking change for a client SDKs
• [ ] breaking change for FNs (FN binary must upgrade)
• [ ] breaking change for validators or node operators (must upgrade binaries)
• [ ] breaking change for on-chain data layout
• [ ] necessitate either a data wipe or data migration

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