Shared: Generate final tree-sitter classes

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[Copilot]

Pull request overview

This PR updates the tree-sitter QL library generation to emit final public wrapper classes and hide implementation details behind private *Impl classes, aligning generated AST APIs across multiple languages/modules.

Changes:

• Extend the Rust QL generator model to support final, private, and class-alias declarations, and generate AstNodeImpl/TokenImpl plus final class AstNode = AstNodeImpl; wrappers.
• Regenerate multiple TreeSitter-backed QL AST libraries to use *Impl base classes and mark generated node/token classes as final.
• Update ql/Cargo.lock to reflect dependency graph changes (notably removal of url and related transitive crates).

Show a summary per file

File	Description
unified/ql/lib/codeql/unified/Ast.qll	Switch Unified AST base/token classes to *Impl + final wrapper aliases; mark generated classes final.
shared/tree-sitter-extractor/src/generator/ql.rs	Add support in the QL emitter for final, private, and class-alias output in Class rendering.
shared/tree-sitter-extractor/src/generator/ql_gen.rs	Generate AstNodeImpl/TokenImpl plus final alias wrappers; adjust supertypes to use impl bases.
shared/tree-sitter-extractor/src/generator/mod.rs	Adjust generator assembly to handle multiple returned classes for AstNode/Token.
ruby/ql/lib/codeql/ruby/ast/internal/TreeSitter.qll	Regenerated Ruby/Erb TreeSitter AST wrappers with *Impl bases and final classes/aliases.
ql/ql/src/codeql_ql/ast/internal/TreeSitter.qll	Regenerated QL/Dbscheme/Blame/JSON TreeSitter AST wrappers with *Impl bases and final classes/aliases.
ql/Cargo.lock	Update Rust lockfile to match revised dependencies.

Review details

• Files reviewed: 6/7 changed files
• Comments generated: 1
• Review effort level: Low