fix: event listeners should obey start and stop

[pauldambra]

fixes: #1378

instead of registering these event listeners in the constructor we should register when starting and unregister them when stopping

tested by running locally and validating that i still see browser hidden events

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Aug 26, 2024 1:50pm

[github-actions]

Size Change: +1.74 kB (+0.15%)

Total Size: 1.17 MB

Filename	Size	Change
dist/array.full.js	334 kB	+440 B (+0.13%)
dist/array.js	155 kB	+432 B (+0.28%)
dist/main.js	156 kB	+432 B (+0.28%)
dist/module.js	155 kB	+432 B (+0.28%)

ℹ️ View Unchanged

Filename	Size
dist/exception-autocapture.js	10.4 kB
dist/recorder-v2.js	110 kB
dist/recorder.js	110 kB
dist/surveys-preview.js	59.8 kB
dist/surveys.js	66 kB
dist/tracing-headers.js	8.26 kB
dist/web-vitals.js	5.79 kB

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