"UMD" build with tsup

[gksander]

Description

Drops webpack for tsup for the browser/umd build which simplifies the build steps quite a bit. Note: umd file will now be imported from a different location (lib/index.global.js instead of dist/spectacle.min.js). We can tweak that name, I believe, if we need to.

Fixes # (issue)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Checklist: (Feel free to delete this section upon completion)

• I have included a changeset if this change will require a version change to one of the packages.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have run pnpm run check:ci and all checks pass
• I have added tests that prove my fix is effective or that my feature works
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

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[carloskelly13]

Kicked the tires locally and dropped it into some one-page decks and things just worked. My only thought is if we want to produce a minified build as well.