feat: export rollup types
Description
I have been working on the vite plugin in Nx.
We use the vite API to call build
When watch mode is enabled buid() returns a RollupWatcher emitting RollupWatcherEvent
I can not add types in the code because import { RollupWatcher, RollupWatcherEvent } from 'rollup'; import from the rollup package installed by Nx which is not compatible with the rollup version used by vite.
With this change I could  import { RollupWatcher, RollupWatcherEvent } from 'vite'; and add those types to the code.
What is the purpose of this pull request?
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Bug fix 
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New Feature 
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Documentation update 
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Other 
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Read the Contributing Guidelines. 
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Read the Pull Request Guidelines and follow the PR Title Convention. 
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Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
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Ideally, include relevant tests that fail without this PR but pass with it.