Fix the typescript declaration in the built files.

[sandhose]

See #11 (comment)

This adds a separate tsconfig for microbundle to use for generating the .d.ts declaration files.

This is the output dist/ folder when running npm compile:

dist/atomWithMutation.d.ts
dist/atomWithQuery.d.ts
dist/atomWithSubscription.d.ts
dist/clientAtom.d.ts
dist/common.d.ts
dist/index.d.ts
dist/index.modern.js
dist/index.modern.js.map
dist/index.modern.mjs
dist/index.modern.mjs.map
dist/index.umd.js
dist/index.umd.js.map
dist/suspenseAtom.d.ts
dist/types.d.ts

[codesandbox-ci]

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Latest deployment of this branch, based on commit 80c191f:

Sandbox	Source
React	Configuration
React Typescript	Configuration

[dai-shi]

Thanks!!!

We should give up using microbundle as it's no longer zero configs.
@Thisen should be working on a tsup based solution.

[dai-shi]

https://www.npmjs.com/package/jotai-urql/v/0.7.1