feat(providers): proxy request for a certain provider

[geekbrother]

Description

This PR adds an ability to request a certain provider in the proxy handler.
At the moment when we are querying the proxy for the certain chain_id the weighted provider is used and we can't test the request to the certain provider.

Our integration tests uses the proxy requests and when we are requesting the certain chain_id the server requests a weighted provider and not the provider in tests itself. This makes tests flaky and unstable as we can't make sure what provider exactly was requested for test.

This PR making the following changes:

• Adds an optional providerId request parameter for the proxy handler.
• Adds get_provider_by_provider_id helper function to get the exact provider.
• Making changes to all provider's integration tests to use the certain provider instead of weighted.
• Allow exact provider requests only for the allowed project ID in RPC_PROXY_TESTING_PROJECT_ID.

ProviderId should be the same as in the ProviderKind.

How Has This Been Tested?

Manual:

• Start the server locally by RPC_PROXY_TESTING_PROJECT_ID=projectXXX cargo run
• Run the curl query with the additional providerId parameter:

curl -v 'http://localhost:3000/v1/?chainId=eip155:999&projectId=projectXXX&providerId=Zora' --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}'

The expected result is the server log where the Zora exact provider was used and successful response:

{"jsonrpc":"2.0","result":"0x3e7","id":1}

CI/CD:

Integration tests are included in this PR.

Merging requirements 🚧

• Sync GitHub Actions PROJECT_ID with the Terraform Cloud testing_project_id to allow CI/CD tests suite run the exact provider requests on staging and prod.

Due Diligence

• Breaking change
• Requires a documentation update
• Requires a e2e/integration test update

[geekbrother]

Cippy started to warn on this trait implementation, adding a temporary allow to fix this later.

[arein]

Can you enable this in staging only?

[geekbrother]

Can you enable this in staging only?

I've updated it and now this request is only allowed by a certain project ID to allow only our testing suite to run it or manually when knowing the project ID that's allowed by the RPC_PROXY_TESTING_PROJECT_ID configuration variable.
In this case, we can test it in both staging, prod, and manually if needed.

[chris13524]

LGTM

[geekbrother]

An integration test is added to test the exact provider request with allowed/not allowed projectId.