This was originally supported, as evidenced by ignored tests. Consider reinstating those tests after support is reintroduced.

Currently only the JSON-RPC methods defined in starknet_ws_api.json are supported via websockets. Other methods defined in the spec could be supported (like starknet_getBlockWithTxHashes or starknet_addInvokeTransaction), as well as Devnet-specific methods (like devnet_mint).