Use `quickjs-emscripten` instead of `vm2` to execute PAC file code

[TooTallNate]

The vm2 module has been deprecated and has critical security vulnerabilities. The suggested replacement module isolated-vm is not suitable for these packages, since it relies on a C++ binary. The reason for that is because the common use-case for these proxy agent modules is within CLI applications, which usually would not otherwise depend on a C++ module.

Instead, these packages will use the quickjs-emscripten module to execute the user code in an isolated QuickJS environment compiled to WASM. This should allow the highest level of sandboxing and will hopefully put an end to this cat and mouse game once and for all.

Fixes #218.

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🦋 Changeset detected

Latest commit: a8eb5fba10248313faa29a78bf4e15def9a322fb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

| Name | Type | | --------------- | ----- | | pac-proxy-agent | Major | | pac-resolver | Major | | degenerator | Major | | proxy-agent | Minor |

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Name	Status	Preview	Updated (UTC)
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[sfc-gh-dszmolka]

hey @TooTallNate first of all major kudos for the quick fix here ! just a question: do you think there's any chance backporting the fix to earlier major versions of proxy-agent ? to be more precise, the v5 line.

edit: or perhaps only in degenerator v3 ?

[TooTallNate]

@sfc-gh-dszmolka No, the fix will not be backported since this commit is a breaking change.