fix: exports TreeshakingPreset

[moltar]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

Closes: #5128

Description

Exports TreeshakingPreset to fix tsup --dts-resolve flag.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
rollup	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 11, 2023 6:24pm

[codecov]

Codecov Report

Merging #5131 (98a8aa5) into master (a5c88b7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5131   +/-   ##
=======================================
  Coverage   98.93%   98.93%           
=======================================
  Files         226      226           
  Lines        8444     8444           
  Branches     2319     2319           
=======================================
  Hits         8354     8354           
  Misses         32       32           
  Partials       58       58           

[github-actions]

This PR has been released as part of rollup@4.0.0-19. Note that this is a pre-release, so to test it, you need to install Rollup via npm install rollup@4.0.0-19 or npm install rollup@beta. It will likely become part of a regular release later.

[rollup-bot]

This PR has been released as part of rollup@3.29.2. You can test it via npm install rollup.