state_machine no_std witness externalities (#6934)

* checkpoint before removing CT from change trie

* before trie backend without tx

* undo

* Started no transaction, but would need using a different root
calculation method, out of the scope of this pr, will roll back.

* Remove NoTransaction.

* partially address review.
dummy stats implementation for no_std.

* Remove ChangeTrieOverlay.

* modified function

* Remove witness_ext

* need noops changes root

* update from cumulus branch

* line break

* remove warning

* line break

* From review: renamings and stats active in no std (except time).

* include cache, exclude change trie cache with individual temporary bad looking
no_std check

* little test

* fuse imports and filter_map prepare_extrinsics_input_inner fold.

* put back ExtInner into Ext, awkward double proto for new function.

* Apply suggestions from code review

* Update primitives/state-machine/Cargo.toml

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/primitives/externalities/src/extensions.rs

@@ -22,7 +22,9 @@
 //!
 //! It is required that each extension implements the [`Extension`] trait.
 
-use std::{collections::HashMap, collections::hash_map::Entry, any::{Any, TypeId}, ops::DerefMut};
+use sp_std::{
+	collections::btree_map::{BTreeMap, Entry}, any::{Any, TypeId}, ops::DerefMut, boxed::Box,
+};
 use crate::Error;
 
 /// Marker trait for types that should be registered as [`Externalities`](crate::Externalities) extension.
@@ -104,9 +106,10 @@ pub trait ExtensionStore {
 /// Stores extensions that should be made available through the externalities.
 #[derive(Default)]
 pub struct Extensions {
-	extensions: HashMap<TypeId, Box<dyn Extension>>,
+	extensions: BTreeMap<TypeId, Box<dyn Extension>>,
 }
 
+#[cfg(feature = "std")]
 impl std::fmt::Debug for Extensions {
 	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 		write!(f, "Extensions: ({})", self.extensions.len())

substrate/primitives/externalities/src/lib.rs

@@ -15,6 +15,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#![cfg_attr(not(feature = "std"), no_std)]
+
 //! Substrate externalities abstraction
 //!
 //! The externalities mainly provide access to storage and to registered extensions. Extensions
@@ -23,7 +25,7 @@
 //!
 //! This crate exposes the main [`Externalities`] trait.
 
-use std::any::{Any, TypeId};
+use sp_std::{any::{Any, TypeId}, vec::Vec, boxed::Box};
 
 use sp_storage::{ChildInfo, TrackedStorageKey};