Constraint Pattern: require activity A before next activity B

[bashbash]

ccamargo
https://jira.jpl.nasa.gov/browse/AERIEQS-212
Moderate
Some Clipper flight rules use language like "...before start of the next science observation". We already have a StartOf constraint node. To implement language like this we would like a "BeforeNext" constraint node.

Possible signature for this new constraint node:

• *Return Type:*Set of windows
• *Return Value:*All windows before the next window
• Required Fields:
  ** {{expression}}: Expression yielding sets of windows

Tasks

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1. Add connectTo operation between Spans #1112
   constraints feature +2
   
2. Add operation to check coexistence of span inside span #1113
   constraints feature +2
   

[mattdailis]

Both subtasks have been completed