Nyall Dawson e416d77270 Add an optional QgsFeedback object for QgsFeatureRequest, and use
this to abort the acquisition of a connection in the OGR
connection pool

Provide a mechanism to avoid a deadlock when multiple OGR iterators
are trying to obtain a connection to a resource at once.

Refs https://github.com/qgis/QGIS/issues/43572
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