Add HSL wrapper

[AJ0070]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

What this PR adds

• Weak dependency wiring for HSL with extension activation only when HSL and SparseArrays are loaded.
• Two new algorithms:
  • HSLMA57Factorization
  • HSLMA97Factorization
• Full extension implementation for init_cacheval and solve! with:
  • sparse CSC / square / symmetric-or-Hermitian validation
  • HSL exception handling mapped to ReturnCode.Failure
  • cache reuse behavior aligned with existing extension patterns
• Dedicated HSL test group:
  • GROUP=LinearSolveHSL routing in test harness
  • isolated test environment under test/hsl
  • wrapper behavior tests for both MA57 and MA97
• License-aware test execution modes:
  • default mode: skip safely when HSL_jll is non-functional
  • strict mode: LINEARSOLVE_HSL_REQUIRE_FUNCTIONAL=true forces failure if licensed binaries are unavailable
• Manual workflow entry for HSL group execution.

resolves #51

AI Disclosure: Used codex 5.3 to write tests and documentation and verify the implementation of the implementation.

[AJ0070]

@ChrisRackauckas after completing this I'll start working on MUMPS wrapper

[AJ0070]

@ChrisRackauckas I can't test this properly because I don't have HSL licence. Do you know someone who has license and can help me out by testing this?

[ChrisRackauckas]

instead use the new test_groups in test.

[AJ0070]

done