integrate verifier-core into LCW

[jchartrand]

https://github.com/digitalcredentials/verifier-core is an extraction of the duplicate/common verification code that is in both VerifierPlus and LCW.

LCW (and VerifierPlus) therefore needs to be reworked to replace the existing verification code with verifier-core.

I've tried it at a high level in V+ and it does work - I replaced the call to verifyCredential in https://github.com/digitalcredentials/web-verifier-plus/blob/main/pages/api/verify.ts with the new call to verifier-core and it successfully returns the result.

See: digitalcredentials/web-verifier-plus#155

I've not yet tried it in LCW, but hopefully things more or less work. Note the undici caveat in the V+ issue above. Seems unlikely that will be a problem in LCW since it was seemingly a problem with the V+ NextJS SWC compiler.

The new result, however, is a bit different from the old result and so the code in LCW that uses the result has to be reworked to use the new result structure. The new result structure is a fair bit simpler though do this should help simplify the the LCW code too.