feat: extend hotpath coverage across crates

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/object-data-cache/Cargo.toml

@@ -27,7 +27,14 @@ categories = ["web-programming", "development-tools"]
 [lib]
 doctest = false
 
+[features]
+default = []
+hotpath = ["hotpath/hotpath", "hotpath/tokio"]
+hotpath-alloc = ["hotpath", "hotpath/hotpath-alloc"]
+hotpath-cpu = ["hotpath", "hotpath/hotpath-cpu"]
+
 [dependencies]
+hotpath.workspace = true
 bytes = { workspace = true, features = ["serde"] }
 metrics = { workspace = true }
 moka = { workspace = true, features = ["future"] }