Store MROs in cache files instead of recomputing them #4921
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This is a prerequisite for loading .data.json files on demand (#4910),
since if MROs are computed on-demand when a tree is loaded, it is
impossible to detect changes in the MRO caused by a change in some
other file that triggered an on-demand load.
This has been split out of #4910 for staging reasons: landing the parts
the modify the cache formats will make it easier to do testing with real-world
commits on the rest of #4910 (which is higher risk).