fix(keyring-snap-bridge): set Snap ID during deserialize

[ccharly]

Using the snapId in the constructor was working fine in the current setup, unfortunately this cannot be used with our keyring lifecycle.

The way the KeyringController creates keyring is:

• Creates the keyring with its builder new Keyring(...)
  • We cannot really pass dynamic options here
  • The Snap keyring v2 will be instantiated BY the KeyringController that have no knowledge about Snap IDs
• Call deserialize with some custom data
  • That's what we need to use to inject the Snap ID we need

Some thing like:

await controller.addNewKeyring(KeyringType.Snap /* v2 */, { snapId, accounts: { ... } });