Preserve fold in DateTime.time()

[AryanRG]

DateTime.time() drops fold=1, unlike datetime.datetime.time(). Recombining the extracted time with the original date and timezone can therefore change the instant: one hour earlier during New York's rollback, or 30 minutes earlier during Lord Howe's rollback.

Pass self.fold to the existing Time constructor. Twelve regression cases cover both folds, naive/UTC/named-zone extraction, clock fields and microseconds, the naive Time return value, and timestamp-preserving reconstruction across both rollbacks.

Validation on macOS arm64 / Python 3.12.15:

• Full pure-Python suite (PENDULUM_EXTENSIONS=0, importing this checkout): 1,882 passed, 3 skipped (one Windows-only test and two existing zoneinfo limitations).
• Ruff lint/format and full Mypy: passed (228 files).
• Changed-file prek hooks and git diff --check: passed.

Native-extension build/tests and Rust checks were not run because cargo and rustc are unavailable. Other platforms and Python versions were not tested locally.

Pull Request Check List

• Added tests for changed code.
• Updated documentation for changed code.

No documentation change: this restores the inherited datetime.time() fold-preservation contract without adding an API.