Refactor composite activity input and scoped memory #3815
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Instead, the parent/child relationship of the containing ExpressionExecutionContext is leveraged to lookup declared variables
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This PR changes the way composite activity input is handled by first evaluating the inputs and then storing them in local variables. This fixes the issue where at some point, certain context is no longer available that is necessary for the potential chain of expressions to be evaluated.
The PR also restores hierarchical memory, allowing nested memory registers to "hide" variables from higher levels. This prevents variable collision between composite activities and consuming workflows.