Proof of concept: Add a new runtime that uses pallet_contracts (#186)

* seal: Copy over a legacy version of pallet_contracts from substrate

* seal: Fix substrate dependency pathes and add as dependency to runtime

* seal: Adapt pallet to current substrate version

* seal: Add contracts pallet to runtime

* seal: Implement rpc runtime api

* seal: Update to latest rpc output format

* seal: Replace child trie by prefix trie

* seal: Add contracts endpoint to the client

* seal: fixup rpc test

* Fix whitespace issue

Co-authored-by: Sergei Shulepov <sergei@parity.io>

* seal: Move pallet out of the runtime directory

* seal: Create a seperate runtime for contracts

* Move parachains to top level directory

* seal: Disable rent for easier testing

Co-authored-by: Sergei Shulepov <sergei@parity.io>

rococo-parachains/pallets/contracts/fixtures/storage_size.wat

@@ -0,0 +1,60 @@
+(module
+	(import "env" "ext_get_storage" (func $ext_get_storage (param i32) (result i32)))
+	(import "env" "ext_set_storage" (func $ext_set_storage (param i32 i32 i32)))
+	(import "env" "ext_scratch_size" (func $ext_scratch_size (result i32)))
+	(import "env" "ext_scratch_read" (func $ext_scratch_read (param i32 i32 i32)))
+	(import "env" "memory" (memory 16 16))
+
+	(func $assert (param i32)
+		(block $ok
+			(br_if $ok
+				(get_local 0)
+			)
+			(unreachable)
+		)
+	)
+
+	(func (export "call")
+		;; assert $ext_scratch_size == 8
+		(call $assert
+			(i32.eq
+				(call $ext_scratch_size)
+				(i32.const 4)
+			)
+		)
+
+		;; copy contents of the scratch buffer into the contract's memory.
+		(call $ext_scratch_read
+			(i32.const 32)		;; Pointer in memory to the place where to copy.
+			(i32.const 0)		;; Offset from the start of the scratch buffer.
+			(i32.const 4)		;; Count of bytes to copy.
+		)
+
+		;; place a garbage value in storage, the size of which is specified by the call input.
+		(call $ext_set_storage
+			(i32.const 0)		;; Pointer to storage key
+			(i32.const 0)		;; Pointer to value
+			(i32.load (i32.const 32))	;; Size of value
+		)
+
+		(call $assert
+			(i32.eq
+				(call $ext_get_storage
+					(i32.const 0)		;; Pointer to storage key
+				)
+				(i32.const 0)
+			)
+		)
+
+		(call $assert
+			(i32.eq
+				(call $ext_scratch_size)
+				(i32.load (i32.const 32))
+			)
+		)
+	)
+
+	(func (export "deploy"))
+
+	(data (i32.const 0) "\01")	;; Storage key (32 B)
+)