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/weights/Cargo.toml

@@ -23,7 +23,6 @@ serde = { optional = true, features = ["alloc", "derive"], workspace = true }
 smallvec = "1.11.0"
 sp-arithmetic = { path = "../arithmetic", default-features = false }
 sp-debug-derive = { path = "../debug-derive", default-features = false }
-sp-std = { path = "../std", default-features = false }
 schemars = { version = "0.8.3", default-features = false, optional = true }
 
 [features]
@@ -35,7 +34,6 @@ std = [
 	"serde/std",
 	"sp-arithmetic/std",
 	"sp-debug-derive/std",
-	"sp-std/std",
 ]
 # By default some types have documentation, `full-metadata-docs` allows to add documentation to
 # more types in the metadata.