Add tmp::path::move

[bugdea1er]

Add a tmp::path::move method which moves the managed path to the given target:

/// Moves the managed path recursively to a given target, releasing
/// ownership of the managed path
/// @param to   A path to the target file or directory
/// @throws std::filesystem::filesystem_error if cannot move the owned path
void move(const std::filesystem::path& to);