Integration Testing setup

[batphonghan]

How to test this locally:

• brew install kurtosis-tech/tap/kurtosis-cli to install kurtosis
• kurtosis engine start to start engine
• cd testing && go test ./... -v

What's in this PR:

[X] Eth1/eth2 run in docker container manage by kurtosis_context in our Go test code

• Eth1 by anvil container
• Eth2 by kurtosis

[X] Smart contracts deploy to eth1 (anvil)

[X] Start node in separate goroutine to start node

[X] Config file + data at ~/.stader_testing folder

• ~/.stader_testing separate testing data for each suite

[X] Init wallet
[X] Http-test server

• http test server assert pre-sign message

[X] Verify pre-sign messages

• Verify signature
• Verify decrypt / encrypt RSA