refactor: Minimize futures dependencies (#2248)

* refactor: Replace futures with futures-util

* fix: Add futures-executor

* Revert "fix: Add futures-executor"

This reverts commit eb3664f.

* Use futures in core and handle features

* fix

* fix

* Revert to futures

core/Cargo.toml

@@ -140,6 +140,7 @@ services-sftp = [
   "dep:openssh-sftp-client",
   "dep:bb8",
   "dep:owning_ref",
+  "futures/executor",
 ]
 services-sled = ["dep:sled"]
 services-supabase = []
@@ -171,7 +172,7 @@ bytes = "1.2"
 chrono = "0.4.24"
 dashmap = { version = "5.4", optional = true }
 flagset = "0.4"
-futures = { version = "0.3", features = ["alloc"] }
+futures = { version = "0.3", default-features = false, features = ["alloc"] }
 hdrs = { version = "0.2", optional = true, features = ["async_file"] }
 http = "0.2.5"
 hyper = "0.14"