Optimize Fetcher::find and fix quickinstall reporting (#579)

* Optimize `Fetcher::find`: Make it non-async to avoid boxing
   and return `AutoAbortJoinHandle<...>` instead.
   
   Since spawning a new task in tokio box the future anyway, boxing the
   returned future again in `Fetcher::find` merely adds unnecessary
   overheads.
* Optimize `QuickInstall::report`: Make it async fn instead of ret `JoinHandle`
   
   This provides several benefits:
    - On debug build, no task will be spawned
    - The calls to `self.stats_url()` can be evaluated in parallel.
    - The task now returns `()` so that the task spawned is smaller.
* Fix `QuickInstall::find`: `warn!` if quickinstall report fails

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

crates/binstalk/src/ops/resolve.rs

@@ -20,7 +20,7 @@ use crate::{
     drivers::fetch_crate_cratesio,
     errors::BinstallError,
     fetchers::{Data, Fetcher, TargetData},
-    helpers::{remote::Client, tasks::AutoAbortJoinHandle},
+    helpers::remote::Client,
     manifests::cargo_toml_binstall::{Meta, PkgMeta, PkgOverride},
 };
 
@@ -162,10 +162,7 @@ async fn resolve_inner(
             .cartesian_product(resolvers)
             .map(|(target_data, f)| {
                 let fetcher = f(opts.client.clone(), data.clone(), target_data);
-                (
-                    fetcher.clone(),
-                    AutoAbortJoinHandle::spawn(async move { fetcher.find().await }),
-                )
+                (fetcher.clone(), fetcher.find())
             }),
     );