*: add simulator e2e tests

[gyuho]

Load simulator for subnet-evm + C-chain

Usage:
  simulator [flags]

Flags:
  -f, --base-fee uint                  Base fee (default 25)
  -c, --concurrency int                Concurrency (default 10)
  -e, --endpoints strings              If non-empty, it loads the endpoints from the YAML and overwrites --config
  -h, --help                           help for simulator
  -k, --keys string                    Directory for key files (default ".simulator/keys")
  -o, --network-runner-output string   If non-empty, it loads the endpoints from the YAML and overwrites --config
  -p, --priority-fee uint              Base fee (default 1)
  -t, --timeout duration               Duration to run simulator (default 1m0s)

Adding my old e2e tests to spin up a cluster https://github.com/ava-labs/subnet-evm/blob/fed7e3c2649f328f775821046a1d7693c78aa768/tests/e2e/e2e_test.go, and integrate with simulator.