Tx simulation only supports hardcoded secp256k1 keys

[fedekunze]

Summary of Bug

Tx simulation and automatic gas adjustment (gas=auto) don't work for chains that don't support the default secp256k1 keys. This is due to a hardcoded key type when simulating txs:

cosmos-sdk/client/tx/factory.go

Line 312 in 21e6f7c

PubKey: &secp256k1.PubKey{},

Version

master and v0.45.1

Steps to Reproduce

evmosd tx staking create-validator '--pubkey={"@type":"/cosmos.crypto.ed25519.PubKey","key":"Ul+8+77luvvDZdabsVtCGA4A2yFXlo+0MFtf7gOQkMA="}' --gas=auto

Error: rpc error: code = InvalidArgument desc = unrecognized/unsupported public key type: *secp256k1.PubKey: invalid pubkey: invalid request

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[tarcieri]

@fedekunze semi-related, we encountered the unrecognized/unsupported public key type: *secp256k1.PubKey: invalid pubkey: invalid request error with our Evmos gentx. Is there a reason these are unsupported? We're unable to use Ledger multisignature account keys because of this:

evmychan/something-special#177