Add base58 as a built-in string validator

[elee1766]

Request a feature

I would like support for the base58 encoding for string verification in stdlib: https://datatracker.ietf.org/doc/html/draft-msporny-base58-03

🤷 Motivation

I would like to not redeclare a base58 type in many projects that I work on. It's a bit of a pain.

Base58 is quite widely used at this point, importantly, it is used as a standard encoding for Solana and some parts of Bitcoin.

💡 Solution

Implement base58 encoding with regex /^[\dA-HJ-NP-Za-km-z]+$/;

there is no special url encoded version like base64, so it should be just be a matter of adding the regexStringNode and registering it