Support `maxClockSkew`

Not sure how new features the DigitalBazaar library are generally integrated, but it would be great if this library can also support the `maxClockSkew` to allow for differences in time between issuers/holders/verifiers

https://github.com/digitalbazaar/vc/blob/955cafe253783a171d5f4ad95ec283182fcb977a/lib/index.js#L228C29-L228C41