feat: add entry name to manifest

[brillout]

Description

Adds chunk.name (the Rollup entry name) to the manifest.

Additional context

This makes finding entries in the manifest much easier. Until now I was using brittle heuristics to find entries in the manifest. I've now stubmled a situation where this PR is needed (when the entry file resolves into a sibling package in a monorepo).

Meta frameworks know the entry names, so adding chunk.name will make it trivial to find entries in the manifest.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines, especially the Pull Request Guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Update the corresponding documentation if needed.
• Ideally, include relevant tests that fail without this PR but pass with it.

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[patak-dev]

We discussed this feature in the last Vite team meeting, and we decided to move forward with it in Vite 5.2