Build zkeys in parallel

[NicoSerranoP]

Prerequisites

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Motivation

The zkey building process could be time consuming if the circuit are large.

Details

We could use a Promise.all([ ... ]) or something similar to build the .zkeys in parallel rather than sequentially. Remember that we need all zkeys for the next steps of the setup process.

https://github.com/privacy-scaling-explorations/p0tion/blob/085b7949650e46d8d23b09366e2fc5afc2d08dbe/packages/phase2cli/src/commands/setup.ts#L547

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