allow opting out from events timestamp check (fix #2513, #3933)

[semiaddict]

This PR introduces a new app config: skipEventsTimestampCheck.
This boolean config option allows opting out from the events timestamp check.
The timestamp check seems to have been introduced in 360a10f to fix rare edge cases, but it also introduces new bugs that prevent some events from firing when mounting components in iframes (see #2513) or new browser windows (see #3933).

The introduced bug can render an application unusable, as many events won't fire; only those who pass the timestamp check do.

This PR does not introduce any breaking changes and sets the new config option to false by default for backward compatibility.

Closes #2513 #3933

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[Hyperblaster]

Any chance we can actually get this merged?

[raphaelmenges]

I would also highly appreciate a merge!