Node/Hack: Add tool to test go-ethereum subscriptions

[bruce-riley]

This PR creates a tool to test that go-ethereum subscriptions work for a given endpoint. This can be used to verify a new chain before adding guardian support.

This PR was originally created to facilitate testing of any changes made to address this SeiEVM issue. It uses the go-ethereum library to subscribe for log events from the wormhole core contract and just logs them out.

To run the app for SeiEVM:

$ git clone -b node/hack_seievm_test_app https://github.com/wormholelabs-xyz/wormhole
$ cd wormhole/node/hack/evm_test
$ go run wstest.go --rpc wss://evm-ws-testnet.sei-apis.com --contract 0xBB73cB66C26740F31d1FabDC6b7A46a038A300dd

To generate an event from the core contract:

$ cast send --rpc-url https://evm-rpc-testnet.sei-apis.com/ --private-key $YOUR_WALLET_KEY 0xBB73cB66C26740F31d1FabDC6b7A46a038A300dd "publishMessage(uint32,bytes,uint8)" 43 0xdeadbeef 202

Using the current testnet public RPC, this does not see events. If you use the evm proxy instead, it does see events.

Ideally, this should see new events generated using the testnet public RPC. (Note that it should not see historical events.)

[evan-gray]

looks helpful and hack folder appropriate