feat: mangle private properties

[pauldambra]

terser will mangle properties that match a regex, otherwise class fields don't get mangled

we have field names like startCaptureAndTrySendingQueuedSnapshots

makes everything private in session recording class prefixed with an _ and tells terser to mangle it

opening PR to see whether it helps, if each field is only referenced once then it won't have much impact

[github-actions]

Size Change: -27.2 kB (-3%)

Total Size: 827 kB

Filename	Size	Change
dist/array.full.js	177 kB	-6.38 kB (-3%)
dist/array.js	118 kB	-6.26 kB (-5%)	✅
dist/es.js	118 kB	-6.25 kB (-5%)	✅
dist/exception-autocapture.js	11.8 kB	-202 B (-2%)
dist/module.js	119 kB	-6.25 kB (-5%)	✅
dist/recorder-v2.js	106 kB	-286 B (0%)
dist/recorder.js	58.4 kB	-162 B (0%)
dist/surveys-module-previews.js	61.2 kB	-749 B (-1%)
dist/surveys.js	57.6 kB	-685 B (-1%)

_{compressed-size-action}