feat(codegen): filter generated clients by codec annotations

[vobradovich]

Summary:

• @codec: <value> filtering is now applied in client-gen-js, client-gen-v2, and sol-gen.
• sol-gen now skips scale-only methods and still includes dual and ethabi methods.
• Shared codec logic remains centralized in sails-idl-meta.
• Parser preservation test coverage exists for @codec.

[gemini-code-assist]

Code Review

This pull request introduces a mechanism to filter service functions in generated clients (JS, Rust, and Solidity) based on a new @codec annotation in the IDL. It adds a utility module in sails-idl-meta to parse these annotations and determine codec availability. Feedback focuses on optimizing the codec resolution logic to avoid unnecessary BTreeSet allocations in no_std environments and extending the filtering logic to include events in the JS generator.