feat: added generate_files implementation on namespace using temporary nodes, moved some non mutable fields out of inners

feat: added modified implementation of run_script/run_command/copy_from_node in NativeProvider, removed unused comments

feat: added builder for options types used in provider traits methods, moved error next to provider traits

feat: added new set_mode method on FileSystem trait to modify permissions bits, added implementations and tests

feat: work on NativeProvider with individual Node, Namespace and Provider struct threadsafe using RwLock and Arc, added implementation logic of resume/restart/pause, destroy and helpers for logs

feat: moved MockFileSystem to InMemoryFileSystem, files too, and added mirror implementation of tokio::fs with tests