chain-spec: getting ready for native-runtime-free world (#1256)

This PR prepares chains specs for _native-runtime-free_  world.

This PR has following changes:
- `substrate`:
  - adds support for:
- JSON based `GenesisConfig` to `ChainSpec` allowing interaction with
runtime `GenesisBuilder` API.
- interacting with arbitrary runtime wasm blob to[
`chain-spec-builder`](https://github.com/paritytech/substrate/blob/3ef576eaeb3f42610e85daecc464961cf1295570/bin/utils/chain-spec-builder/src/lib.rs#L46)
command line util,
- removes
[`code`](https://github.com/paritytech/substrate/blob/3ef576eaeb3f42610e85daecc464961cf1295570/frame/system/src/lib.rs#L660)
from `system_pallet`
  - adds `code` to the `ChainSpec`
- deprecates
[`ChainSpec::from_genesis`](https://github.com/paritytech/substrate/blob/3ef576eaeb3f42610e85daecc464961cf1295570/client/chain-spec/src/chain_spec.rs#L263),
but also changes the signature of this method extending it with `code`
argument.
[`ChainSpec::builder()`](https://github.com/paritytech/substrate/blob/20bee680ed098be7239cf7a6b804cd4de267983e/client/chain-spec/src/chain_spec.rs#L507)
should be used instead.
- `polkadot`:
- all references to `RuntimeGenesisConfig` in `node/service` are
removed,
- all
`(kusama|polkadot|versi|rococo|wococo)_(staging|dev)_genesis_config`
functions now return the JSON patch for default runtime `GenesisConfig`,
  - `ChainSpecBuilder` is used, `ChainSpec::from_genesis` is removed,

- `cumulus`:
  - `ChainSpecBuilder` is used, `ChainSpec::from_genesis` is removed,
- _JSON_ patch configuration used instead of `RuntimeGenesisConfig
struct` in all chain specs.
  
---------

Co-authored-by: command-bot <>
Co-authored-by: Javier Viola <javier@parity.io>
Co-authored-by: Davide Galassi <davxy@datawok.net>
Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>
Co-authored-by: Kevin Krone <kevin@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>

cumulus/parachains/integration-tests/emulated/common/Cargo.toml

@@ -10,6 +10,7 @@ publish = false
 [dependencies]
 codec = { package = "parity-scale-codec", version = "3.4.0", default-features = false }
 paste = "1.0.14"
+serde_json = "1.0.104"
 
 # Substrate
 grandpa = { package = "sc-consensus-grandpa", path = "../../../../../substrate/client/consensus/grandpa" }
@@ -24,6 +25,7 @@ pallet-staking = { path = "../../../../../substrate/frame/staking", default-feat
 pallet-message-queue = { path = "../../../../../substrate/frame/message-queue", default-features = false}
 pallet-im-online = { path = "../../../../../substrate/frame/im-online", default-features = false}
 beefy-primitives = { package = "sp-consensus-beefy", path = "../../../../../substrate/primitives/consensus/beefy" }
+sc-chain-spec = { path = "../../../../../substrate/client/chain-spec", default-features = false }
 
 # Polkadot
 polkadot-core-primitives = { path = "../../../../../polkadot/core-primitives", default-features = false}