Configures SwifterPM materialization through install passthrough

SwifterPM’s –cached-directory-materialization option can now be passed through Tuist’s existing install passthrough arguments, either via Config.project.generatedProject.installOptions.passthroughSwiftPackageManagerArguments or the TUIST_INSTALL_PASSTHROUGH_ARGUMENTS environment variable. This keeps the CLI surface smaller than adding a dedicated environment variable, and the option is still gated by the existing TUIST_USE_SWIFTERPM opt-in.