feat: save posthog config at start of session recording

[pauldambra]

let's capture posthog config at the start of recording

that way we'll have posthog config, session recording config, and decide response in network payloads when we're debugging

[github-actions]

Size Change: +292 B (0%)

Total Size: 781 kB

Filename	Size	Change
dist/array.full.js	183 kB	+73 B (0%)
dist/array.js	124 kB	+73 B (0%)
dist/es.js	124 kB	+73 B (0%)
dist/module.js	125 kB	+73 B (0%)

ℹ️ View Unchanged

Filename	Size
dist/exception-autocapture.js	12 kB
dist/recorder-v2.js	105 kB
dist/recorder.js	58.6 kB
dist/surveys.js	48.8 kB

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