Feat/soldeer init

[Solthodox]

• Add remove_forge_lib util in config.rs to remove .gitmodules and lib/
• Add get_latest_forge_std_dependency function in remote.rs to fetch the latest version of forge-std and return the dependency object to install.
• Add Init command in commands.rs
• Add Init subcommand logic in lib.rs: remove forge lib + install latest forge-std
• Update README
• Automatically remap libs to dependencies in foundry.toml and add a default remapping for forge-std in there current forge-std imports work properly