Removes Rust binaries (such as .dll/.so libraries), C wrapper object files,
invokes cargo clean to reset cargo target directory
(found by default at pkg_root/src/rust/target/).
Useful when Rust code should be recompiled from scratch.
clean(path = ".", echo = TRUE)character vector with names of all deleted files (invisibly).
if (FALSE) { # \dontrun{
clean()
} # }