Reduce the image preparation and creation time

This is a tracking issue to reduce the compilation and image creation time of the build system.

• Implement an option in the bootstrap scripts to enable the REPO_BINARY environment variable on the .config file (to disable the recipe compilation and download precompiled packages from the package server)
• Provide precompiled binaries for redoxfs, cookbook, installer and libtool
• Use sccache (compilation cache) to share Rust, C and C++ library objects between recipes
• Incremental Cookbook compilation using git diff
• Implement parallel recipe fetch