perf(build): ⚡ migrate from tsup to faster tsdown

[okineadev]

Build speed has been accelerated from ... 20 seconds (my Node.js crashed during the build) to 3 seconds 🔥 (with parallel build of all packages)

https://tsdown.dev

[pkg-pr-new]

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@slidev/client

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/client@2160

create-slidev

npm i https://pkg.pr.new/slidevjs/slidev/create-slidev@2160

create-slidev-theme

npm i https://pkg.pr.new/slidevjs/slidev/create-slidev-theme@2160

@slidev/parser

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/parser@2160

@slidev/cli

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/cli@2160

@slidev/types

npm i https://pkg.pr.new/slidevjs/slidev/@slidev/types@2160

commit: 418c1d4

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[okineadev]

This is not a problem on my side but on e87924d