Deprecate sp-std

[aurexav]

No description provided.

[Copilot]

Pull Request Overview

Deprecate use of sp-std by removing it from dependencies and replacing its APIs with core/alloc imports across various crates.

• Remove sp-std entries in Cargo.toml and std feature lists.
• Add extern crate alloc where needed and replace sp_std imports with core or alloc.
• Update no_std modules to depend on alloc and core crates appropriately.

Reviewed Changes

Copilot reviewed 85 out of 85 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
precompile/state-storage/src/lib.rs	Add alloc for tests and switch comment to // core
precompile/state-storage/Cargo.toml	Remove sp-std dependency
precompile/assets/src/tests.rs	Replace sp_std::str::from_utf8 with alloc::str
precompile/assets/src/mock.rs	Replace sp_std::prelude::* with alloc::vec::Vec
precompile/assets/src/lib.rs	Add alloc for tests; import core conversions
precompile/assets/Cargo.toml	Remove sp-std entries
pallet/staking/src/lib.rs	Add alloc imports; remove sp_std use
pallet/staking/src/benchmarking.rs	Remove sp_std::prelude::*
pallet/staking/Cargo.toml	Remove sp-std entries
pallet/ethtx-forwarder/src/mock.rs	Remove sp_std::prelude::*
pallet/ethtx-forwarder/src/lib.rs	Add alloc imports; remove sp_std::vec::Vec
pallet/ethtx-forwarder/Cargo.toml	Remove sp-std entries
pallet/deposit/src/lib.rs	Add alloc imports; remove sp_std::prelude::*
pallet/deposit/src/benchmarking.rs	Remove sp_std::prelude::*
pallet/deposit/Cargo.toml	Remove sp-std entries
pallet/account-migration/src/lib.rs	Add alloc imports; remove sp_std::prelude::*
pallet/account-migration/src/benchmarking.rs	Remove sp_std::prelude::*
pallet/account-migration/Cargo.toml	Remove sp-std entries
Cargo.toml	Remove top-level sp-std dependency
.maintain/pallet-weight-template.hbs	Replace sp_std::marker::PhantomData with core import