Add EIP-3770 support

[usame-algan]

Consider supporting EIP-3770 Chain-specific addresses: https://eips.ethereum.org/EIPS/eip-3770

For example the isValidAddress function currently returns false if called with something like eth:0xe75c3138F75E98b912f262dc2617C341B51951eE where as it returns true for 0xe75c3138F75E98b912f262dc2617C341B51951eE

[holgerd77]

What is the state of consensus around this standard? Has this been discussed/approved in some way by the community/core devs/wallet providers/etc?

Is there some common ground around this?