[linearsolver] Create data links for preconditioners and ShewchukPCGLinearSolver

[hugtalbot]

The data strings are replaced with Links! Finally! Let's take time to discuss it with others!

@ziqiu-zeng

---

By submitting this pull request, I acknowledge that
I have read, understand, and agree SOFA Developer Certificate of Origin (DCO).

---

Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).

[hugtalbot]

[ci-build][with-all-tests]