Week 11 king minimum ordering

[wifiBlack]

Changes proposed in this pull request:

• Expanded documentation for pgr_kingOrdering and pgr_minDegreeOrdering:
  • Added dedicated .rst files with detailed descriptions, usage examples, and expected results.
  • Updated ordering-family.rst and integrated into CMake and docqueries for consistent build and testing.
• Extended test coverage for both functions:
  • Added new pgTAP tests, including edge cases, crash-resilience scenarios, and PostgreSQL version–specific queries.
  • Cleaned and corrected SQL test files to ensure stable and verifiable outputs.
• Refactored internal implementation of ordering algorithms:
  • Improved type consistency, code readability, and maintainability.

@pgRouting/admins