[AppGateServer] Implement AppGateServer using ShannonSDK

[red-0ne]

Summary

Re-implement AppGateServer using ShannonSDK [1] module.

[1] https://github.com/pokt-network/shannon-sdk

Issue

• 510

Type of change

Select one or more:

• [ ] New feature, functionality or library
• [ ] Bug fix
• [x] Code health or cleanup
• [ ] Documentation
• [ ] Other (specify)

Testing

Documentation changes (only if making doc changes)

• [ ] make docusaurus_start; only needed if you make doc changes

Local Testing (only if making code changes)

• [x] Unit Tests: make go_develop_and_test
• [x] LocalNet E2E Tests: make test_e2e
• See quickstart guide for instructions

PR Testing (only if making code changes)

• [ ] DevNet E2E Tests: Add the devnet-test-e2e label to the PR.
  • THIS IS VERY EXPENSIVE, so only do it after all the reviews are complete.
  • Optionally run make trigger_ci if you want to re-trigger tests without any code changes
  • If tests fail, try re-running failed tests only using the GitHub UI as shown here

Sanity Checklist

• [x] I have tested my changes using the available tooling
• [x] I have commented my code
• [x] I have performed a self-review of my own code; both comments & source code
• [ ] I create and reference any new tickets, if applicable
• [x] I have left TODOs throughout the codebase, if applicable

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[red-0ne]

@Olshansk , Updated this PR to reflect the change on shannon-sdk that is no longer relying on method or headers, since it now assumes that the whole request (not only the body is serialized).

This led to change the way we are transmitting the upstream request to the RelayMiner which needs to use the same headers and methods.

A SerializableHttp{Request,Response} structs have been added with their corresponding codecs to embed the bytes representation of http.{Request,Response} intoRelay{Request/Response}`s.

One last point, even if unrelated to this feature (while it is to the codec). Is the proper handling of upstream request -> appgateserver -> backend_url paths and query strings.

[github-actions[bot]]

The CI will now also run the e2e tests on devnet, which increases the time it takes to complete all CI checks.

You may need to run make trigger_ci to submit an empty commit that'll trigger the tests.

GCP workloads (requires changing the namespace to 554)) Grafana network dashboard for devnet-issue-{issue-id}