sp-std removal from substrate/primitives (#3274)

This PR removes sp-std crate from substrate/primitives sub-directories.

For now crates that have `pub use` of sp-std or export macros that would
necessitate users of the macros to `extern crate alloc` have been
excluded from this PR.

There should be no breaking changes in this PR.

---------

Co-authored-by: Koute <koute@users.noreply.github.com>

substrate/primitives/tracing/Cargo.toml

@@ -21,7 +21,6 @@ features = ["with-tracing"]
 targets = ["wasm32-unknown-unknown", "x86_64-unknown-linux-gnu"]
 
 [dependencies]
-sp-std = { path = "../std", default-features = false }
 codec = { version = "3.6.1", package = "parity-scale-codec", default-features = false, features = [
 	"derive",
 ] }
@@ -36,7 +35,6 @@ default = ["std"]
 with-tracing = ["codec/derive", "codec/full"]
 std = [
 	"codec/std",
-	"sp-std/std",
 	"tracing-core/std",
 	"tracing-subscriber",
 	"tracing/std",