XCM simulator (#3538)

* Add xcm-simulator and xcm-simulator-example.

* Abstract xcmp and dmp handling.

* Use mock message queue.

* Xcm simulator example unit tests.

* Use relay chain block number on sending msg.

* Fix typo.

* fmt

* more fmt

* Fix deps.

polkadot/Cargo.lock

@@ -6701,6 +6701,7 @@ name = "polkadot-parachain"
 version = "0.9.8"
 dependencies = [
  "derive_more",
+ "frame-support",
  "parity-scale-codec",
  "parity-util-mem",
  "polkadot-core-primitives",
@@ -10660,9 +10661,9 @@ checksum = "502d53007c02d7605a05df1c1a73ee436952781653da5d0bf57ad608f66932c1"
 
 [[package]]
 name = "syn"
-version = "1.0.67"
+version = "1.0.74"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6498a9efc342871f91cc2d0d694c674368b4ceb40f62b65a7a08c3792935e702"
+checksum = "1873d832550d4588c3dbc20f01361ab00bfe741048f71e3fecf145a7cc18b29c"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -12303,6 +12304,45 @@ dependencies = [
  "xcm",
 ]
 
+[[package]]
+name = "xcm-simulator"
+version = "0.9.8"
+dependencies = [
+ "frame-support",
+ "parity-scale-codec",
+ "paste",
+ "polkadot-core-primitives",
+ "polkadot-parachain",
+ "polkadot-runtime-parachains",
+ "sp-io",
+ "sp-std",
+ "xcm",
+ "xcm-executor",
+]
+
+[[package]]
+name = "xcm-simulator-example"
+version = "0.9.8"
+dependencies = [
+ "frame-support",
+ "frame-system",
+ "pallet-balances",
+ "pallet-xcm",
+ "parity-scale-codec",
+ "paste",
+ "polkadot-core-primitives",
+ "polkadot-parachain",
+ "polkadot-runtime-parachains",
+ "sp-core",
+ "sp-io",
+ "sp-runtime",
+ "sp-std",
+ "xcm",
+ "xcm-builder",
+ "xcm-executor",
+ "xcm-simulator",
+]
+
 [[package]]
 name = "yamux"
 version = "0.9.0"