Merge branch 'ps/odb-in-memory'

Add a new odb "in-memory" source that is meant to only hold
tentative objects (like the virtual blob object that represents the
working tree file used by "git blame").

* ps/odb-in-memory:
  t/unit-tests: add tests for the in-memory object source
  odb: generic in-memory source
  odb/source-inmemory: stub out remaining functions
  odb/source-inmemory: implement `freshen_object()` callback
  odb/source-inmemory: implement `count_objects()` callback
  odb/source-inmemory: implement `find_abbrev_len()` callback
  odb/source-inmemory: implement `for_each_object()` callback
  odb/source-inmemory: convert to use oidtree
  oidtree: add ability to store data
  cbtree: allow using arbitrary wrapper structures for nodes
  odb/source-inmemory: implement `write_object_stream()` callback
  odb/source-inmemory: implement `write_object()` callback
  odb/source-inmemory: implement `read_object_stream()` callback
  odb/source-inmemory: implement `read_object_info()` callback
  odb: fix unnecessary call to `find_cached_object()`
  odb/source-inmemory: implement `free()` callback
  odb: introduce "in-memory" source

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