Modernize tsconfig.json for Node.js module resolution

[minggangw]

• Switch module and moduleResolution to nodenext to align with modern Node.js library publishing and ES module resolution semantics.
• Bump target and lib to es2022. The project's existing engines floor (node >= 20.20.2) guarantees full ES2022 runtime support, so targeting es2022 is safe and lets type-checking reflect modern language features instead of nodenext's floating target: esnext.
• Add "types": ["node"] so raw tsc --noEmit resolves Node globals (Buffer, setTimeout, child_process, events, AbortSignal) without relying on tsd's implicit @types/node injection.
• Refactor a top-level await in test/types/index.test-d.ts into an async IIFE, since nodenext classifies the file as CommonJS where top-level await is illegal.
• Remove stale boilerplate section-label comments (Strict Type-Checking Options, Additional Checks) carried over from the original generated tsconfig template.

Fix: #1527

[Copilot]

Pull request overview

This pull request updates the repository’s TypeScript configuration to use modern Node.js-aware module settings (nodenext) and aligns the type test suite with the updated compilation behavior.

Changes:

• Switched tsconfig.json to "module" / "moduleResolution": "nodenext" and bumped the compilation target/lib to ES2022.
• Explicitly included Node.js ambient types in tsconfig.json.
• Adjusted the Rate type test to avoid top-level await and to assert both the promised and awaited createRate() types.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
tsconfig.json	Modernizes TS compiler settings for Node.js module resolution and ES2022 baseline.
test/types/index.test-d.ts	Updates type assertions around createRate() and avoids top-level await in the type test.

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[coveralls]

coverage: 85.523%. remained the same — minggangw:fix-1527 into RobotWebTools:develop