fix: angular change detection mutation observer

[pauldambra]

we get periodic reports of performance issues with angular

angular change detection patches browser methods

we do change detection too

so we fight each other

this

• grabs MutationObserver from an iframe so that we aren't using angular's patched methods
• fixes detection of whether Angular has patched a method
• adds an eslint rule so we don't use MutationObserver directly in future

TODO

• also fix rrweb's detection of whether angular has patched this

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Nov 18, 2024 11:43am

[github-actions]

Size Change: +15.6 kB (+0.5%)

Total Size: 3.13 MB

Filename	Size	Change
dist/all-external-dependencies.js	204 kB	+651 B (+0.32%)
dist/array.full.es5.js	254 kB	+441 B (+0.17%)
dist/array.full.js	356 kB	+651 B (+0.18%)
dist/array.full.no-external.js	355 kB	+651 B (+0.18%)
dist/array.js	171 kB	+659 B (+0.39%)
dist/array.no-external.js	170 kB	+657 B (+0.39%)
dist/dead-clicks-autocapture.js	13.7 kB	+688 B (+5.3%)	🔍
dist/exception-autocapture.js	9.45 kB	+644 B (+7.31%)	🔍
dist/external-scripts-loader.js	2.88 kB	+686 B (+31.25%)	🚨
dist/main.js	172 kB	+659 B (+0.38%)
dist/module.full.js	356 kB	+651 B (+0.18%)
dist/module.full.no-external.js	355 kB	+651 B (+0.18%)
dist/module.js	171 kB	+659 B (+0.39%)
dist/module.no-external.js	170 kB	+659 B (+0.39%)
dist/recorder-v2.js	114 kB	+658 B (+0.58%)
dist/recorder.js	114 kB	+658 B (+0.58%)
dist/surveys-preview.js	58.2 kB	+1.55 kB (+2.74%)
dist/surveys.js	62.8 kB	+688 B (+1.11%)
dist/tracing-headers.js	2.81 kB	+1.48 kB (+111.36%)	🆘
dist/web-vitals.js	11.9 kB	+1.52 kB (+14.68%)	⚠️

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[marandaneto]

nice, love the linter rule

[marandaneto]

don't know much about angular but it looks like it does what the PR description says, LGTM