[kernel] moves some (non casual) Db features to Boot

src/kernel_internals/runtime/boot.ml

src/kernel_internals/runtime/boot.mli

src/kernel_services/plugin_entry_points/db.ml

src/kernel_services/plugin_entry_points/db.mli

src/plugins/aorai/tests/Aorai_test.ml

src/plugins/gui/analyses_manager.ml

src/plugins/gui/design.ml

src/plugins/gui/file_manager.ml

src/plugins/gui/launcher.ml