fix: support tree-shaking

[angeloashmore]

Types of changes

• [ ] Chore (a non-breaking change which is related to package maintenance)
• [x] Bug fix (a non-breaking change which fixes an issue)
• [ ] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

This PR adds support for tree-shaking. Only used chunks (i.e. components, functions) from @prismicio/next are included in a Next.js app's JavaScript bundle.

Without this PR, @prismicio/next's full bundle and its dependencies would be included in a Next.js app's JavaScript bundle.

To accomplish this, Rollup's preserveModules option was enabled. This effectively disables bundling (at least in this package's case), preserving the source files (i.e. chunks). This allows Next.js's bundler to properly remove whole unused chunks from its output.

As part of this change, siroc was replaced by unbuild as a build tool. unbuild results in better build output.

Fixes #35

Checklist:

• [ ] My change requires an update to the official documentation.
• [x] All TSDoc comments are up-to-date and new ones have been added where necessary.
• [x] All new and existing tests are passing.

🦤

[codecov-commenter]

Codecov Report

Merging #36 (b3f73dc) into main (38d1b24) will not change coverage. The diff coverage is n/a.

:exclamation: Current head b3f73dc differs from pull request most recent head 783cb35. Consider uploading reports for the commit 783cb35 to get more accurate results

@@            Coverage Diff            @@
##              main       #36   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           11        11           
  Lines          665       665           
  Branches        33        33           
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  Hits           665       665           

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