Simpler vite port with tsx

[jacobparis]

This merges into the eslint-no-trigger-core-import since it builds on top of that

This is a simpler vite port that comes with a few caveats

• the server must run with tsx in both development and production
• requires /core and /core-backend to have "type": "module"

Advantages:

• development and prod are much more similar
• tsx handles esm/cjs interop better and I haven't been seeing any of the client side navigation errors from before
• we can use almost the same server.ts as before, which you're already familiar with

Disadvantages:

• Some people don't like running tsx in production since it transpiles on the fly and will run with higher memory usage. There's currently no way to get tsx to output a bundle that can be run with plain node for production, and I didn't have good results trying to replicate it.
• Other trigger infrastructure may not be happy with core and core-backend having type: module set, or if these packages themselves require more changes for themselves to function this way. I don't know if this is a rabbit hole that would eventually require more and more things to switch to ESM.

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• [ ] I have followed every step in the contributing guide
• [ ] The PR title follows the convention.
• [ ] I ran and tested the code works

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Latest commit: 062fb69583c08d359e67155c1c920e2b791e18d5

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[matt-aitken]

I think the other approach makes more sense, once the upstream Vite changes have happened. And when it's a good time to make a sweeping change.