fix(bundling): add missing main export for @nx/vite

[jaysoo]

The missing main export is causing issues when fetching the package sometimes.

Current Behavior

Expected Behavior

Related Issue(s)

Fixes #

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 27, 2023 2:45pm

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✅ Successfully ran 8 targets

• linux nx affected --target=e2e --base=1363baea28da820e2d5563ab0476d213c39217d2 --head=7574a21f121fb88ea920f1f4080de83d269d2579 --parallel=1
• linux nx affected --target=test --base=1363baea28da820e2d5563ab0476d213c39217d2 --head=7574a21f121fb88ea920f1f4080de83d269d2579 --parallel=1
• linux nx affected --target=build --base=1363baea28da820e2d5563ab0476d213c39217d2 --head=7574a21f121fb88ea920f1f4080de83d269d2579 --parallel=3
• linux nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• linux nx affected --target=lint --base=1363baea28da820e2d5563ab0476d213c39217d2 --head=7574a21f121fb88ea920f1f4080de83d269d2579 --parallel=3
• nx-cloud record -- nx format:check --base=1363baea28da820e2d5563ab0476d213c39217d2 --head=7574a21f121fb88ea920f1f4080de83d269d2579
• linux nx documentation --no-dte
• macos nx affected -t e2e-macos --parallel=1 --base=1363baea28da820e2d5563ab0476d213c39217d2 --head=7574a21f121fb88ea920f1f4080de83d269d2579

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[github-actions]

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