feat: allow triggering sessions when events occur

[richard-better]

folk frequently want to control their cost and volume of recordings

this allows them to set a config to start replay "paused" and only start sending data to the server when specified events are seen

Client side of PostHog/posthog#26168

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Nov 14, 2024 4:50pm

[github-actions]

Size Change: +8.19 kB (+0.26%)

Total Size: 3.11 MB

Filename	Size	Change
dist/array.full.es5.js	254 kB	+910 B (+0.36%)
dist/array.full.js	356 kB	+808 B (+0.23%)
dist/array.full.no-external.js	355 kB	+808 B (+0.23%)
dist/array.js	171 kB	+809 B (+0.48%)
dist/array.no-external.js	170 kB	+809 B (+0.48%)
dist/main.js	172 kB	+809 B (+0.47%)
dist/module.full.js	355 kB	+808 B (+0.23%)
dist/module.full.no-external.js	355 kB	+808 B (+0.23%)
dist/module.js	171 kB	+809 B (+0.48%)
dist/module.no-external.js	170 kB	+809 B (+0.48%)

ℹ️ View Unchanged

Filename	Size
dist/all-external-dependencies.js	204 kB
dist/dead-clicks-autocapture.js	13 kB
dist/exception-autocapture.js	8.8 kB
dist/external-scripts-loader.js	2.19 kB
dist/recorder-v2.js	113 kB
dist/recorder.js	113 kB
dist/surveys-preview.js	56.7 kB
dist/surveys.js	62.1 kB
dist/tracing-headers.js	1.33 kB
dist/web-vitals.js	10.3 kB

_{compressed-size-action}

[pauldambra]

some thoughts but otherwise...

👍