Consider alternatives for deep equal implementation

[dlongley]

          Consider https://github.com/lukeed/dequal or https://nodejs.org/api/util.html#utilisdeepstrictequalval1-val2.

Originally posted by @davidlehn in #102 (comment)

Note: We don't want to pull in another library for this if we can avoid it, but using the node implementation would work. I don't know if there's something equivalent on the Web platform though.

EDIT: I forgot this is node-only -- so we should just switch over to the util.isDeepStrictEqual API.

[BigBlueHat]

FWIW, node's assert module also includes a deepStrictEqual that's rather nice:
https://nodejs.org/api/assert.html#assertdeepstrictequalactual-expected-message

Not sure if it's a fit for this use case or not, but thought I'd share.

[BigBlueHat]

Relates to fixing inline objects not working in this code:
https://github.com/digitalbazaar/bedrock-vc-delivery/blob/v5.3.3/lib/oid4/oid4vci.js#L373-L377