Implement Precompiles::remove

[kpp]

In previous versions it was possible to remove precompiles with:

let p = precompiles.to_mut();
p.remove(address);

Would you please provide the same functionality or tell me a suitable API for you so I can implement it?

[rakita]

Hmm, you would need your own struct that implements PrecompileProvider, something similar to EthPrecompiles or OpPrecompiles.