feat: nuke rollup, configure export conditions

[jacob-ebey]

feat: nuke rollup into oblivion in favor of tsup

This PR does quite a bit yet nothing at the same time:

• Removes Rollup in favor of tsup to easily produces ESM and CJS modules and types (ran per package now, coordinated with pnpm run --recursive
• Updates conditions to be "default" instead of "require" as the last condition as we are a CJS module and having a "default" condition is good practice
• Updates conditions to add support for "node" and "module-sync" to avoid dual module hazards by either always resolving to ESM when require("esm") is available, otherwise always the CJS versions.
• adds https://github.com/google/wireit for per package build caches (dropped subsequent CI time by quite a bit and makes running integration tests locally a lot better by only re-building the changed packages)

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Latest commit: 9495f7b

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[github-actions]

🤖 Hello there,

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🤖 Hello there,

We just published version 6.28.1-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

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We just published version 6.28.1 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

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🤖 Hello there,

We just published version 7.1.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

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[github-actions]

🤖 Hello there,

We just published version 6.28.2-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!