feat: use rollup to make this package easier to import

[ForbesLindesay]

[see #21]

[rollingversions[bot]]

Change Log for funtypes (1.0.0 → 2.0.0)

Breaking Changes

• Remove decorators support

  I don't think they're a very widely used feature, and they increase the bundle size and require effort to maintain.

Performance Improvements

• Use rollup to bundle funtypes into a single CommonJS/ESM file

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