feat: support Bun by using ShadowRealm

[sheremet-va]

Description

Currently, all jsdom tests are failing because bun doesn't seem to correctly support VM module.

The reason why other tests are failing is still unknown to me,

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[AriPerkkio]

all jsdom tests are failing because bun doesn't seem to correctly support VM module.

The compatibility page says that "VM modules" are not supported but I interpreted that as "importModuleDynamically does not work". Maybe I'm just reading this wrong. 🙃

It does say that core node:vm functionalities are implemented. I think JSDOM was using createContext+runInContext which seem to be exported: https://github.com/oven-sh/bun/blob/51d3d4382281f789f8175079ed426a63529eb3e7/src/js/node/vm.ts#L8. I haven't yet had time to try this out but maybe there's something still missing.

[sheremet-va]

ShadowRealm was moved back to Stage 2. This PR is already outdated, and by the time ShadowRealm is in stage 3 again, it will be severely outdated. Let's revisit this when ShadowRealm is stable.