Module Cache tab on the build detail page

The build detail page now surfaces a Module Cache tab when the build's associated command event recorded binary-cache data, bringing the same cache hit/miss breakdown, per-module hash, and JSON export already available on command and test run pages to xcodebuild runs.

Module Cache tab on a build detail page, showing cache hits, misses, hit rate, a stacked bar of local/remote/missed cacheable targets, and a per-module table with hit status and hash