Error handling

[fabalchemy]

Which feature do you think can be improved?
Error handling when performing fallible operations.

How can it be improved?
Don't silently ignore Results and propagate them to the crate user.

Additional Information

Some examples :

cgroups-rs/src/cgroup.rs

Lines 63 to 65 in 1df6e7a

	fn create(&self) {
	if self.hier.v2() {
	let _ret = create_v2_cgroup(self.hier.root(), &self.path);

cgroups-rs/src/cgroup_builder.rs

Lines 137 to 141 in 1df6e7a

	pub fn build(self, hier: Box<dyn Hierarchy>) -> Cgroup {
	let cg = Cgroup::new(hier, self.name);
	let _ret = cg.apply(&self.resources);
	cg
	}

Is there a rationale behind this design choice?
I'd like to propose a PR to implement error propagation, which could be implemented behind a feature flag for backwards compatibility.

[liubin]

I'd prefer to raise the exceptions to the caller but not hide them inside cgroup-rs.

/cc @jodh-intel @Tim-Zhang