optionalDependencies should be excluded by default

[IlyaSemenov]

By default tsup bundles all imported modules but dependencies and peerDependencies in package.json are always excluded.

I believe that optionalDependencies should be also excluded by default, as they are essentially the dependencies which are simply allowed to not exist, and the library author is supposed to import them dynamically and handle failed imports gracefully.

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[ytkimirti]

+1 on this. Spent a lot of time debugging it