fix: support new clang-dumper template names

[lm-sousa]

The future clang-dumper can serialize UsingTemplate and DependentTemplate names, but Clava currently rejects both kinds.

This adds AST models and parser support for the using-shadow declaration, dependent qualifier, and dependent name spelling emitted by clang-dumper.

Verification:

• gradle -p ClangAstParser compileJava
• git diff --check

Model: GPT-5.6-Luna

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[sonarqubecloud]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)
C Security Rating on New Code (required ≥ A)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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