rustdoc: add ways of collapsing all impl blocks #141663
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either shift+click the Summary button,
or use the
_
key.this collapses everything,
including (inherent) impl blocks.
no need for a special "expand all impl blocks"
method, as impl blocks are expanded during regular "expand all".
doing "expand all" -> "collapse all" will always
result in only impl blocks being expaned.
not sure the best way to add a GUI test.
fixes #134429