feat(@rspack/core): add typings about LoaderDefinition

[Asuka109]

Summary

🤖 Generated by Copilot at 10df027

This pull request enhances the loader system of @rspack/core by adding generic types and interfaces to the LoaderContext and loader definitions in packages/rspack/src/config/adapter-rule-use.ts. It also updates various test cases in webpack-test to use the new types and interfaces from the @rspack/core package instead of relative paths, improving code consistency and readability.

Walkthrough

🤖 Generated by Copilot at 10df027

• Make LoaderContext interface generic and optional (link, link, link, link)
• Add new interfaces for loader definition functions and pitch functions (link, link)
• Export new interfaces and LoaderContext from types.ts (link)
• Update test case loaders to import interfaces from @rspack/core package (link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link)
• Format test case loaders to follow code style conventions (link, link)

[changeset-bot]

⚠️ No Changeset found

Latest commit: af9569e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR