[6.x.x] Optimise Path Expressions that are visited by the BasicExpressionVisitor #5083
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Previously Path Expressions visited by the BasicExpressionVisitor were not optimisable. This means that a number of possible optimisations were never applied. One such example is that expressions inside of Extension Expressions were not previously optimised.
This PR also includes a number of micro-optimisations to reduce memory use of the optimizer a small amount.
NOTE: requires #5081 to be merged first.