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/trie/src/error.rs

@@ -15,7 +15,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use sp_std::{boxed::Box, vec::Vec};
+use alloc::{boxed::Box, vec::Vec};
 
 /// Error type used for trie related errors.
 #[derive(Debug, PartialEq, Eq, Clone)]