smaller dependency footprint to futures by opentelemetry crate

Author: shaun-cox

opentelemetry/Cargo.toml

@@ -21,7 +21,8 @@ all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
-futures-util = { version = "0.3", default-features = false, features = ["std", "sink"] }
+futures-core = "0.3"
+futures-sink = "0.3"
 indexmap = "2.0"
 once_cell = "1.12.0"
 pin-project-lite = { version = "0.2", optional = true }

opentelemetry/src/trace/context.rs

@@ -4,7 +4,8 @@ use crate::{
     trace::{Span, SpanContext, Status},
     Context, ContextGuard, KeyValue,
 };
-use futures_util::{sink::Sink, stream::Stream};
+use futures_core::stream::Stream;
+use futures_sink::Sink;
 use once_cell::sync::Lazy;
 use pin_project_lite::pin_project;
 use std::{