Feat: Microbundle compat bundler and React based jotai utils core

[barelyhuman]

Requirements

• Update base version to 18
• Add in the base layer to support react specific utilities for jotai-form

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[dai-shi]

In case you are concerned, I don't think we need to keep UMD compatibility if it causes too much trouble. ESM and CJS would probably be okay.

[barelyhuman]

Makes sense, already wrote it though, and there's not much to do there.
I just needed to be able to modify rollup's config to allow simple multi entry builds which seems to be a pain with microbundle.

[barelyhuman]

Validated the existing exports and types work on new project using vite.