feat(bindings/c): add opendal_operator_check

[asukaminato0721]

Which issue does this PR close?

part of #2959.

Rationale for this change

What changes are included in this PR?

Are there any user-facing changes?

add opendal_operator_check

[asukaminato0721]

todo: test, doc

[Xuanwo]

remove_xxx APIs are going to deprecate after delete support recursive. Let's hold on for a while.

[Xuanwo]

remove_xxx APIs are going to deprecate after delete support recursive. Let's hold on for a while.

It's better not to introduce those API before we has #3922 implemented.

[Xuanwo]

Thank you @asukaminato0721 for this!

[chitralverma]

@asukaminato0721 @Xuanwo shouldn't this lister be triggered with limit(1) or perhaps a stat call?

[asukaminato0721]

@asukaminato0721 @Xuanwo shouldn't this lister be triggered with limit(1) or perhaps a stat call?

it's the same "code" as the async version.

opendal/core/src/types/operator/operator.rs

Lines 217 to 224 in 2282db5

	pub async fn check(&self) -> Result<()> {
	let mut ds = self.lister("/").await?;
	match ds.next().await {
	Some(Err(e)) if e.kind() != ErrorKind::NotFound => Err(e),
	_ => Ok(()),
	}
	}