Improve log messages when loading/unloading state

[matthewdarwin]

When loading or unloading state (startup, shutdown) and config database-map-mode = heap, then nodeos prints log messages like:

CHAINBASE: Preloading "state" database file, this could take a moment...
               1% complete...
               10% complete...
               18% complete...
               26% complete...
               34% complete...
               41% complete...

The % complete messages don't say what is loading or unloading making it harder for log file parsers to know what is going on as you need the context from the "first" line here.

Better would be something like:

Loading chainbase, 1% complete
Loading chainbase, 10% complete

[spoonincode]

would be nice to figure out a clean way to get appbase & chainbase to participate in the standard logging mechanism 🤔

[heifner]

Why not just add dependence on fc to appbase & chainbase

[spoonincode]

submodule hell is my first thought 😅 like wouldn't you have to be extra careful that the fc submodule is the same all across chainbase & appbase & mandel to ensure ODR satisfied?

[heifner]

Maybe via https://cmake.org/cmake/help/latest/module/FetchContent.html where you specify a mandel wide version of fc.