Easy post_mortem

[nshepperd]

Adds a convenient and easy post_mortem() function that can be called to immediately trigger the graphical postmortem debugger given any exc_info structure. We need to suspend sys.monitoring callbacks while doing this, because the built in reentrancy protection doesn't apply when pydevd suspends directly from normal code instead of a monitoring callback. Functions were added in _pydevd_sys_monitoring to do that.

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[nshepperd]

See #1530.