As part of SERVER-79181 we integrated QuerySettings into CanonicalQuery.

After having a conversation with david.storch@mongodb.com, we agreed that:

• ExpressionContext is a better place for it
• When running $lookup a sub-pipeline can be created and executed, however, at this moment, we can not access QuerySettings, as $lookup and similar stages do not have reference to CanonicalQuery

Goal for this ticket would be to remove QuerySettings from CanonicalQuery and move it into ExpressionContext.