Re-design SDK

[shumkov]

To provide good quality SDK for our users and make sure all required functionality is present we need to re-design current SDK that have multiple problems. The idea is to get fresh look and start from users and use cases and then document all components step by step.

Collect requirements:

• [x] #2368
• [x] #2369
• [x] #2281

Design:

• [ ] #2372
• [ ] #2373
  • [ ] Design Wallet Adapter for Web
    • [ ] #2371
    • [ ] Investigate other protocol if needed
  • [ ] Design other adapters (i.e. Dash Core) ...
• [ ] Bindings
  • [ ] Binding for Web
  • [ ] Binding for Swift?
  • [ ] Binding for Kotlin?