Add setting to default to recursive directory collapsing

[Lancear]

Closes #224267 - Always collapse directories recursively

[Lancear]

@microsoft-github-policy-service agree

[thennothinghappened]

It would seem redundant to me to have the Alt behaviour remain as-is when this is enabled - why not have this option swap which behaviour requires Alt? That'd mean with recursive-as-default enabled, holding Alt would then cause a non-recursive collapse, whereas with this option disabled, the inverse is true.