feat: user journeys

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looks good overall. left minor comments, also:

JLCore.stop() removes observers + clears sinks but does not unswizzle. if we can't safely do this, should at least document that behavior. if multiple HCaptcha instances call start/stop, can cause stopped-after-one-instance-stops issue.

[CAMOBAP]

JLCore.stop() removes observers + clears sinks but does not unswizzle. if we can't safely do this, should at least document that behavior.

unswizzle implemented

if multiple HCaptcha instances call start/stop, can cause stopped-after-one-instance-stops issue.

because we do it on the main thread and in the scope of the single call there should not be a problem swizzle and unswizzle can be considered 'atomic'*

method_exchangeImplementations is not thread safe so I assume other libraries that use the same approach to intercept calls do it on main thread too, so it should not lead to a problems