Docstrings for the feature store API are outdated by two versions

[DimitriFrischmann]

The setup guide omits required permissions needed for cloud execution. Adding this information would reduce onboarding friction.

[DimitriFrischmann]

Closes #90 The timestamp validation issue with clinical trial data has been resolved by adding support for multiple timestamp formats and timezone handling. The fix includes a configuration schema for defining expected timestamp patterns and provides informative error messages when data doesn't match expectations. This prevents valid data from being incorrectly quarantined.