Bun / TSC build structure & comparison

[jmuzina]

Note: includes changes from #16 , review and merge that PR first.

Builds the ds package with both tsc & bun build, roughly following the structure shown here.

This functions as an exploration of the benefits and drawbacks of tsc and bun build.

A comparison of their outcomes and our findings are included in README files introduced by this PR.

[jmuzina]

CI fails due to Typescript & Biome disagreeing on whether React imports should use import type React or import React. Biome by default prefers import type React, while Typescript prefers import React.

I am making a change to the biome configuration's jsxRuntime field to fix this. This follows guidance from Biome here. The useImportType rule reads jsxRuntime to decide whether to flag these cases.

We should use "jsxRuntime": "reactClassic" if we use "jsx": "react", as indicated by the above documentation.

[advl]

It can be merged
Two minor things (for a future PR ?)

• document the local override of "allowSyntheticDefaultImports": true in ds/tsconfig.json
• let's try to use the modern react-jsx and make it work with biome ?

[jmuzina]

* document the local override of `"allowSyntheticDefaultImports": true` in ds/tsconfig.json

@advl I was able to remove this override without causing any errors - I think that was a holdover from our debugging stages.

* let's try to use the modern `react-jsx` and make it work with biome ?

I was able to safely switch this over to modern react-jsx and undo the JSX runtime override - no obvious errors. I think it can go in this PR given how simple of a change it was.

Let me know if there's something I've missed that needs to be investigated as part of a separate PR.