[std] Implement Poseidon hash

[gbotrel]

[stefan2904]

For the record, there are implementations by others:

• https://github.com/bnb-chain/gnark/tree/zkbnb-dev/std/hash/poseidon
• https://github.com/philsippl/gnark-playground/blob/poseidon/examples/poseidon/poseidon.go
• https://pkg.go.dev/github.com/vocdoni/gnark-crypto-primitives/poseidon

related:

• #824
• #904