WalletConnect integration

[benjizhai]

During discussions with multiple parties both inside Dfinity and in the community, we seem to agree that while II is great as a next-gen identity solution, it is not suitable as a wallet. Moreover everyone should be able to develop a wallet for their specific usecase without requiring Dapp developers to integrate the wallet specifically.

Thus we propose to introduce a standard wallet interface on the IC, which would serve a similar purpose as WalletConnect on Ethereum, while leveraging IC specific technology.

[benjizhai]

sequenceDiagram
  DApp->>Service: Request Connection
  DApp->>Wallet: Display QR/deeplink
  Service->>Wallet: Get Session Request
  Wallet->>Service: Post Session Status
  Service->>DApp: Get Session Status

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[benjizhai]

After discussions at the WG, we agree that instead of coming up with our own WalletConnect-like interface, we would go for an integration with WalletConnect instead.

Steps:

1. CAIP PRs
2. Implementation details