wip: Add Multichain API support #3759
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Adds support for using the multichain API in Snaps. This is accomplished by setting up a separate provider and substream called
metamask-multichain-provider. Whensnap.requestis called with a multichain request, this provider and substream is used. The clients will need to route to the proper JSON-RPC pipeline based on the substream and verify that the Snap has the proper permission (TBD).Additionally this PR adds a example Snap for usage of this API, that can leverage Ethereum and Solana APIs at once. It also adds limited simulation support for the multichain API. The simulation framework implements a basic version of the multichain API where sessions are tracked and requests are routed to supported EVM providers. There are no underlying providers for non-EVM request, but they can be mocked.
TODO:
wallet_revokeSessionsupport