refactor: ExportData.imports to ExportData.hasImports

[sapphi-red]

Description

ExportData.imports was only used for import.length > 0.
Rewrote imports into hasImports to remove depending on es-module-lexer's type.

refs #8352

Additional context

ExportData types needs to be exported because

• optimizeDeps which is exported from src/node/index.ts returns DepOptimizationMetadata type including ExportData type
  • the return type of optimizeDeps could be changed to Promise<void> to avoid breaking change. I think the return type of optimizeDeps is too specific if it is considered as an public api.
  • optimizeDeps is used only from the cli
• resolvedConfig.createResolver's param type is InternalResolveOptions and it includes ExportData
  • getDepsOptimizer could be removed from resolvedConfig.createResolver's param type

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• 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).
• Ideally, include relevant tests that fail without this PR but pass with it.

[sapphi-red]

It look like this PR makes CI super flaky. 🤨

[patak-dev]

I don't think it is the PR, the CI is super flaky today. Failing even before starting, when it is installing pnpm in mac os for example.

Also, wow... nice move with this change 🙌🏼