feat(builtins): implement subnet.resolve [NET-549]

[justprosh]

Description

Implement subnet resolver without explicitly providing endpoint and use endpoint from decider config.

Motivation

Clients should not be able to change endpoints and endpoint info (credentials, secrets, etc) should be public and changeable by third-parties.

Proposed Changes

• add subnet.resolve builtin

Checklist

• The code follows the project's coding conventions and style guidelines.
• All tests related to the changes have passed successfully.
• Documentation has been updated to reflect the changes (if applicable).
• All new and existing unit tests have passed.
• I have self-reviewed my code and ensured its quality.
• I have added/updated necessary comments to aid understanding.

Reviewer Checklist

• Code has been reviewed for quality and adherence to guidelines.
• Tests have been reviewed and are sufficient to validate the changes.
• Documentation has been reviewed and is up to date.
• Any questions or concerns have been addressed.

[linear]

NET-549 Add subnet.resolve builtin

get rpc endpoint from config