Add `vm.pubKey(uint)(uint,uint)` cheatcode to `Vm.sol`

[pmerkleplant]

Vm.sol provides a function to receive the address of a private key: addr(uint256)(address).
Could we get a function to receive the public key as well?

The public key is a secp256k1 point and should be returned in Affine coordinates, i.e. (unit x_coordinate, uint y_coordinate).

To receive the public key of a private key, you currently either have to implement an ecMul function in solidity, quickly leading to out-of-gas errors or use ffi, leading to big overhead and long-running testsuites.

[mds1]

This makes sense. Can you reopen this issue in the foundry repo and close this one (I don't have permission to transfer the issue), since this would require a new cheat in forge upstream first since currently there's no cheat to do this

[pmerkleplant]

Opened issue in foundry, see foundry-rs/foundry#4790.
Closing, and many thanks ^^