[@xstate/inspect] Handle circular references gracefully in inspector.

[davidkpiano]

This PR fixes stringifying circular reference in @xstate/inspect by using fast-safe-stringify when normal JSON.stringify(...) throws.

Currently, this will result in the string "[Circular]" in the inspect UI, which is much better than completely failing (previous behavior):

Fixes #1497

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[Andarist]

q: is this crucial for this test? or could we just stick to the "not throw" expectation on the end? I mean - onRegister gets called synchronously as far as i can see so this done() here in the middle of a test is slightly distracting (if only it can be avoided, i might miss something)

[davidkpiano]

In the future, register/onRegister may be async, and if that happens, this test will fail.