perf(eslint): cache package.json read in AMD module import rule

- **VS Code Version:** Main branch (Dev)
- **OS Version:** N/A

### Problem Description
In the ESLint rule responsible for checking AMD module imports (`vscode-eslint-plugin-local`), `readFileSync` and `JSON.parse` are executed inside the `create(context)` method.

Because `create(context)` runs for every evaluated file during linting, `package.json` is repeatedly read from the file system and parsed into memory hundreds or thousands of times.

### Proposed Solution / Steps
Move `package.json` reading logic outside of the `create()` method (to module scope) so it only runs once per linting session, eliminating unnecessary disk I/O.

I have a fix ready and would be happy to submit a PR for this!