Add UseMemoDirective and UseNoMemoDirective classes

[mattcosta7]

Summary

Adds UseMemoDirective and UseNoMemoDirective classes to the JavaScript QL library so React compiler directives "use memo" and "use no memo" are modeled as known directives.

Changes

• Add Directive::UseMemoDirective and Directive::UseNoMemoDirective in javascript/ql/lib/semmle/javascript/Stmt.qll
• Add library tests covering both directives
• Add a changenote documenting the new classes

Testing

• Updated javascript/ql/test/library-tests/Directives/tst.js
• Updated expected results in javascript/ql/test/library-tests/Directives/KnownDirective.expected

[Copilot]

Pull request overview

This PR extends the JavaScript QL statement library with first-class classes for the newer React/compiler-style directives use memo and use no memo, so they are treated like the other known directives already modeled in Stmt.qll.

Changes:

• Added Directive::UseMemoDirective for "use memo".
• Added Directive::UseNoMemoDirective for "use no memo".
• Kept the new directive classes aligned with the existing KnownDirective structure and inline documentation style in Stmt.qll.

Show a summary per file

File	Description
javascript/ql/lib/semmle/javascript/Stmt.qll	Adds two new documented KnownDirective subclasses for recognized directive strings.

Copilot's findings

• Files reviewed: 1/1 changed files
• Comments generated: 0