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I want the signerv2 package to support a Web3 remote transaction signer backend.

I want the signerv2 package to support a Web3 remote transaction signer backend.: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Web3SignerFn should return a bind.SignerFn with no setup network call. When that signer is called with a sender address and an Ethereum…

The task

`Web3SignerFn` should return a `bind.SignerFn` with no setup network call. When that signer is called with a sender address and an Ethereum transaction, it should POST a JSON-RPC 2.0 request to the configured URL using method `eth_signTransaction`, content type `application/json`, and one params object containing…

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.