Add try-runtime to Rococo runtime (#6501)

* Add `try-runtime` to Rococo runtime

* Enable try-runtime in all pallets

* Update runtime/rococo/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Add dev-dependencies for the try-runtime test

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

polkadot/Cargo.lock

@@ -8046,10 +8046,12 @@ dependencies = [
  "beefy-merkle-tree",
  "frame-benchmarking",
  "frame-executive",
+ "frame-remote-externalities",
  "frame-support",
  "frame-system",
  "frame-system-benchmarking",
  "frame-system-rpc-runtime-api",
+ "frame-try-runtime",
  "hex-literal",
  "log",
  "pallet-authority-discovery",
@@ -8117,12 +8119,14 @@ dependencies = [
  "sp-session",
  "sp-staking",
  "sp-std",
+ "sp-tracing",
  "sp-transaction-pool",
  "sp-trie",
  "sp-version",
  "static_assertions",
  "substrate-wasm-builder",
  "tiny-keccak",
+ "tokio",
  "xcm",
  "xcm-builder",
  "xcm-executor",