E2E Warp Demo and Basic E2E Test

[aaronbuchwald]

This test should include:

• using warp_client to receive a response from warp_server
• <TODO: this list is incomplete>

[aaronbuchwald]

Simple e2e test: https://github.com/ava-labs/subnet-evm/blob/warp-e2e/tests/warp/warp_test.go