feat: Add kwargs to Collection.collect_all()

[ElisabethBrockhausQC]

Motivation

It's currently not possible to specify the engine for .collect_all().

Changes

[Copilot]

Pull request overview

This PR extends the dy.Collection API to allow forwarding keyword arguments to polars.collect_all(), enabling callers to control Polars collection options (e.g., choosing an execution engine) when collecting all members of a collection.

Changes:

• Add **kwargs to Collection.collect_all() and forward them to pl.collect_all(...).
• Apply formatter-driven refactors that collapse several multi-line expressions into single-line equivalents.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a523310) to head (4ae558d).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #361   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           56        56           
  Lines         3475      3475           
=========================================
  Hits          3475      3475           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.