[#192] Allowed 'LinkHandler' to accept named field properties.

[AlexSkrypnyk]

Iterates on #277 by @chrisolof. Thank you for the contribution!

Summary

• Updated LinkHandler::expand() to accept named field properties (title, uri, options) in addition to the existing numeric index format ([0], [1], [2]).
• Named keys take precedence over numeric indices via PHP null-coalescing (??), so both formats remain fully supported without breaking existing behaviour.
• The options key (named or positional) is passed through parse_str() only when present, and defaults to an empty array to satisfy UnroutedUrlAssembler::assemble().

Changes

• src/Drupal/Driver/Fields/Drupal8/LinkHandler.php - refactored expand() to support named keys alongside numeric indices.

Test plan

• Verify existing tests pass with numeric-index link values (no regression).
• Verify a link field populated with named keys (title, uri, options) is correctly expanded.
• Verify a link field populated with only title and uri (no options) expands without errors.

Closes #192.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: be250f33-3252-4d68-93d2-65f33d73c4d1

📥 Commits

Reviewing files that changed from the base of the PR and between df76871 and 19ec058.

📒 Files selected for processing (2)

• src/Drupal/Driver/Fields/Drupal8/LinkHandler.php
• tests/Drupal/Tests/Driver/LinkHandlerTest.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/192-link-named

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