fix: Import entrypoint improvements

[aklinker1]

This PR refactors the logic around how options are imported from JS entrypoints. Each entrypoint is still read and imported in parallel, but now only one instance of the vite-node dev server is ever setup (instead of one for every JS/TS entrypoint). This closes #1204.

Additionally, while doing the above refactor, I've reduced the footprint of the polyfilled extension environment while entrypoints are imported. Instead of creating multiple environments and polyfilling them in parallel, causing race conditions, the environment is polyfilled only once and is only present while importing the entrypoints. Before, the extension environment was also polyfilled when resolving vite config, the source of #931 (comment). This PR closes #931, and replaces #1231.

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[Timeraa]

Wouldn't this also massively speed up build times?

[aklinker1]

Wouldn't this also massively speed up build times?

It would speed up importing the entrypoints to get their options... I don't know by how much it will effect the overall build. In general, this step is quite short compared to the actual build, so I doubt it will have a huge effect.

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commit: 129cf5e

[codecov]

Codecov Report

Attention: Patch coverage is 92.18750% with 20 lines in your changes missing coverage. Please review.

Project coverage is 81.03%. Comparing base (1dc7c34) to head (129cf5e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/wxt/src/core/builders/vite/index.ts	76.62%	18 Missing ⚠️
...es/wxt/src/core/utils/building/find-entrypoints.ts	98.80%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1207      +/-   ##
==========================================
- Coverage   81.29%   81.03%   -0.26%     
==========================================
  Files         128      128              
  Lines        6245     6286      +41     
  Branches     1066     1066              
==========================================
+ Hits         5077     5094      +17     
- Misses       1153     1177      +24     
  Partials       15       15              

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