Add preview API feature

[masa-koz]

Description

This pull request introduces a new feature flag, preview-api, and updates the Settings struct and related methods in src/lib.rs. The most important changes include adding the new feature flag in Cargo.toml, updating the Settings struct to include a new field, adding a new method under the preview-api feature, and modifying a test function to conditionally use the new method based on the feature flag.

Testing

cargo test --features preview-api

Documentation

TBD

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.83%. Comparing base (b6ebb83) to head (656b0d9).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4730      +/-   ##
==========================================
- Coverage   86.68%   85.83%   -0.86%     
==========================================
  Files          56       56              
  Lines       17363    17363              
==========================================
- Hits        15051    14903     -148     
- Misses       2312     2460     +148     

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