pallet_revive: Change address derivation to use hashing (#7662)

Fixes https://github.com/paritytech/polkadot-sdk/issues/6723

## Motivation

Internal auditors recommended to not truncate Polkadot Addresses when
deriving Ethereum addresses from it. Reasoning is that they are raw
public keys where truncating could lead to collisions when weaknesses in
those curves are discovered in the future. Additionally, some pallets
generate account addresses in a way where only the suffix we were
truncating contains any entropy. The changes in this PR act as a safe
guard against those two points.

## Changes made

We change the `to_address` function to first hash the AccountId32 and
then use trailing 20 bytes as `AccountId20`. If the `AccountId32` ends
with 12x 0xEE we keep our current behaviour of just truncating those
trailing bytes.

## Security Discussion

This will allow us to still recover the original `AccountId20` because
those are constructed by just adding those 12 bytes. Please note that
generating an ed2551...