Report cancelled loads in load metrics

[stasimus]

Closes #386.

A load cancelled while running left no trace in cache_load_result and cache_load_time. CacheMetered now reports it with result=cancelled and the time spent until cancellation. CacheMetrics.load takes a LoadResult (success, failure, cancelled); the Boolean overload stays as a deprecated forwarder.

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[mr-git]

Looks promising, though very hard to review with changes from #369 interleaved.

Shall we try the "Stacked PRs" feature?

[mr-git]

hm.. one unit-test is failing...