Update Bindings

• Update Bindings.xcframework
  • Release https://git.xx.network/elixxir/client/-/pipelines/149708
  • Release https://git.xx.network/elixxir/client/-/pipelines/150275
• Add Contact model that wraps marshaled contact data that Bindings operates on.
• Update API, so the Contact model is used in place of raw Data.
• Update UdSearchCallback so it uses [Contact] results.
• Update UdLookupCallback so it uses Contact result.
• Merge CMixMakeLegacyReceptionIdentity into CMixLegacyReceptionIdentity.