chore: integrate Rslint for type-aware linting

[fi3ework]

Summary

Rslint yes.

Related Links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR adds Rslint (a TypeScript linter) to the project as a development tool and includes associated code changes to address various linting issues throughout the codebase.

• Adds Rslint configuration and integrates it into the linting workflow
• Fixes multiple TypeScript and JavaScript code style issues identified by the linter
• Updates function calls, boolean comparisons, and string template usage for better code quality

Reviewed Changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
rslint.jsonc	Adds Rslint configuration with TypeScript rules (mostly disabled initially)
package.json	Adds @rslint/core dependency and integrates lint:type script into main lint command
packages/plugin-dts/src/utils.ts	Fixes function binding, template string usage, and async function declarations
packages/plugin-dts/src/tsc.ts	Fixes function binding for TypeScript system methods
packages/plugin-dts/src/index.ts	Fixes function binding for TypeScript file existence check
packages/plugin-dts/src/dts.ts	Simplifies boolean comparisons and removes unnecessary non-null assertions
packages/plugin-dts/src/apiExtractor.ts	Removes unnecessary non-null assertion and redundant string operations
packages/core/src/utils/logger.ts	Removes unnecessary template string wrapping
packages/core/src/utils/helper.ts	Updates array type syntax for consistency
packages/core/src/css/libCssExtractLoader.ts	Fixes non-null assertions and string coercion
packages/core/src/css/cssConfig.ts	Refactors return statements to use early returns consistently
packages/core/src/config.ts	Improves boolean comparisons, early returns, and removes unnecessary type assertions
packages/core/src/cli/prepare.ts	Removes unnecessary template string wrapping

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

Comments suppressed due to low confidence (1)

package.json:46

• The package @rslint/core version ^0.1.5 may not exist. Based on the PR description mentioning Rslint from web-infra-dev/rslint, verify this is the correct package name and version.

    "@rslint/core": "^0.1.5",