feat: extend hotpath coverage across crates (#5505)

Add opt-in hotpath feature surfaces to every workspace crate and wire the root rustfs feature passthrough for function, allocation, and CPU profiling.

Add a focused set of function-level measurements for scanner, heal, lock, target replay, IAM, KMS, Keystone, trusted proxy, and capacity paths without adding request-scoped primitive wrappers.

Co-authored-by: heihutu <heihutu@gmail.com>

crates/trusted-proxies/src/cloud/ranges.rs

@@ -227,6 +227,7 @@ pub struct GoogleCloudIpRanges;
 
 impl GoogleCloudIpRanges {
     /// Fetches the latest Google Cloud IP ranges from their official source.
+    #[hotpath::measure]
     pub async fn fetch() -> Result<Vec<IpNetwork>, AppError> {
         let client = Client::builder()
             .timeout(Duration::from_secs(10))