feat: log parser handling events without an end

[lcottercertinia]

Is your feature request related to a problem?

Some events do not seem to have an exit but do take up time I would like to see them reflect on the timeline
An example here would be WF_APPROVAL_SUBMIT events and basically any event within the code unit workflow

Describe the solution you'd like

I know this might be tricky and it would be great to get SF to add an end however the next best would be to use the next event along as the end time. e,g for a WF_APPROVAL_SUBMIT event the next WF_APPROVAL_SUBMIT might be the end stamp.

[lcottercertinia]

Duplicate of #211