Refactor the _catch all type validation_

[daviddias]

Currently, https://github.com/libp2p/js-libp2p-websocket-star/blob/master/src/utils.js#L46-L70 checks for the supported types. This is a tad complex and having this sort of "catch all and verify if this is in the circle of types I support" makes it hard to read.

Instead, be explicit. If you are looking to check if it is a valid multiaddr, use multiaddr.isMultiaddr

[mkg20001]

I don't know how. The multiaddr is sent as a string to the client/server. multiaddr.isMultiaddr(str) returns false afaik.