[#26] Restructured asset_loader as module and added dependencies

.gitmodules

CMakeLists.txt

config/Sources.cmake

modules/CMakeLists.txt

modules/asset_loader/CMakeLists.txt

modules/asset_loader/include/vkcv/asset/asset_loader.hpp

modules/asset_loader/lib/fx-gltf

modules/asset_loader/lib/json

modules/asset_loader/src/vkcv/asset/asset_loader.cpp

projects/CMakeLists.txt

projects/first_mesh/.gitignore

projects/first_mesh/CMakeLists.txt

projects/first_mesh/src/main.cpp

projects/first_triangle/.gitignore

projects/first_triangle/CMakeLists.txt

src/asset_loader/main.cpp