deprecate the `UniversalDID` singleton

[mirceanis]

Development checklist

• [x] 1. deprecate the UniversalDID object
• [x] 2. in the universal-did module, create a DIDResolverImpl internal class with the same functionality as UniversalDID, just not a singleton
• [x] 3. create builder pattern for DIDResolver that returns a DIDResolverImpl instance example usage:

  val resolver : DIDResolver = DIDResolver.Builder
  .addResolver(ethrDidResolver)
  .addResolver(/*...*/)
  .build()

• [x] 4. remove UniversalDID initialization code from JWTTools constructor.
• [x] 5. create a module called uport-defaults
  • 5.1 Create a fun DIDResolver.configureDefaultsWithInfura(infuraProjectId : String) : DIDResolver extension method
  • 5.2 This method should call a DIDResolver.Builder that uses the provided infuraProjectId to configure all the common networks and resolvers in a manner similar to the UniversalDID initialization done in the current JWTTools constructor.
  • 5.3 remove now unused dependencies from the jwt module. It should no longer depend on ethr-did, web-did, uport-did
• [ ] 6. Update documentation to reflect new usage patterns

[mirceanis]

This was fixed in #34 except for the last point. I'll close this and open a new issue for that