Switch to tsup

[csandman]

Switch to using tsup for bundling the dist files. This has the main benefit of bundling the ESM version of the files using the real .mjs file extension, which allows for the exports field in the package.json to work properly. It also appears to solve the problem mentioned in #260, where the id prop coming from Chakra's useFormControl hook were not defined on the server. I'm not exactly sure why this fixes it, but I'll take it.

This change was initially motivated by the fact that Chakra UI also switched to using tsup for their bundling: https://github.com/chakra-ui/chakra-ui/blob/754d9d4/packages/components/tsup.config.ts

Here are the results from arethetypeswrong:

Before

https://arethetypeswrong.github.io/?p=chakra-react-select%404.7.5

After

[codesandbox-ci]

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Latest deployment of this branch, based on commit 836f4de:

Sandbox	Source
chakra-react-select demo	Configuration
chakra-react-select TS demo	Configuration
chakra-react-select + next.js	Configuration
chakra-react-select + next.js + typescript	Configuration