fix: add an exports map

[benmccann]

• Quick Checklist

• I have read the contributing guidelines
• I have written new tests, as applicable - N/A there's no real way to write a test for this
• Docs have been added / updated - N/A
• I have added a changeset, if applicable

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Fixes #402

• What is the new behavior (if this is a feature change)?

Resolves .mjs files

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this
  PR?)

This PR would only be breaking if a user is reaching into the internals of the package. That would become disallowed. However, I don't think there was every a reason to do that or that it's something that should be supported

• Other information:

[changeset-bot]

🦋 Changeset detected

Latest commit: 7e3723b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
imagetools-core	Patch
rollup-plugin-imagetools	Patch
vite-imagetools	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[codecov]

Codecov Report

Merging #404 (7e3723b) into main (a5d1fb9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #404   +/-   ##
=======================================
  Coverage   96.53%   96.53%           
=======================================
  Files          31       31           
  Lines        1097     1097           
  Branches      227      227           
=======================================
  Hits         1059     1059           
  Misses         38       38           

Flag	Coverage Δ
imagetools-core	98.51% <ø> (ø)
rollup-plugin-imagetools	99.20% <ø> (ø)
vite-imagetools	84.84% <ø> (ø)

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