feat: [SIW-1043] Add CBOR decoding assertion function on iOS side

[hevelius]

Short description

This PR adds SwiftCBOR package to easily decoding CBOR assertion on iOS. So this PR introduces a new native function decodeAssertion. The output should be send to the backend.

Using CBOR on native side remove from the backend written in ts the computational cost of managed CBOR encoded data.

List of Changes

• Add SwiftCBOR
• Updated exmaple app
• Update backend

How Has This Been Tested?

• Set value in .env file under example app and backend
• Start metro with cd example && yarn start
• Start backend with cd backend && yarn start
• Using a supported iOS device open Xcode and start the example app
• Try sequentially all the CTA
• Last CTA Verify Assertion should return a value like this {result: {signCount: 1}}

[LazyAfternoons]

LGTM