fix(vitest): support network imports in vm pools

[hi-ogawa]

Description

• Closes network imports not working on vmThreads and vmForks pools #4995

I had no idea the whole external import is handled by its own implementation with vm, Very cool!

For starter, I added a very rudimentary one for network imports, which seems to be working for the test case. I plan to look up other runtime's implementation since I assume it's important to have somewhat of compatibility with NodeJS at least (but their doc doesn't give much detail https://nodejs.org/api/esm.html#https-and-http-imports).

references

• Https imports nodejs/node#36328

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