feat: Use Custom RPC for Sends

[superadi04]

Description

Map chain id resovled from RPC URL to a CDP network identifier (e.g. chain id 8453 resolves to "base"). This will be used to determine if the API should be used for sends, or Web3.py

Builder should be able to pass in their own RPC URL, which will result in tx sends to go to that RPC URL instead of CDP API, and tx waits to also use that RPC URL

If a builder passes an RPC URL for base or base sepolia, the CDP API should still be used for sends, but waits will use their RPC URL

Tests

Checklist

A couple of things to include in your PR for completeness:

• Updated the typescript README if relevant
• Updated the python README if relevant
• Added a changelog entry
• Added e2e tests if introducing new functionality

[cb-heimdall]

🟡 Heimdall Review Status

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[cb-heimdall]

Review Error for ginalw @ 2025-08-05 00:35:41 UTC
User must have write permissions to review

[github-actions]

⚠️ Generated Client Files Have Been Modified

This pull request contains manual changes to generated client files. These files are automatically generated from the OpenAPI specification and should not be edited directly.

Please check the workflow logs for details on which files were modified.

To fix this issue:

1. Revert any manual changes to files in:
   • typescript/src/openapi-client/generated/
   • python/cdp/openapi_client/
   • go/openapi/
2. If you need to change the generated code, update the OpenAPI spec (openapi.yaml) instead
3. Run the generation commands locally to update the generated files

_{This comment will be automatically removed once the issue is resolved.}

[cb-heimdall]

Review Error for ginalw @ 2025-08-19 23:25:26 UTC
User must have write permissions to review