Removes Snowbridge parachain directory (#3186)

Removes the `bridges/snowbridge/parachain` directory and moves
everything up to under `snowbridge` directly. We are cleaning up our
local dev env after merging our crates into the polkadot-sdk.

---------

Co-authored-by: claravanstaden <Cats 4 life!>

bridges/snowbridge/pallets/system/runtime-api/src/lib.rs

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
+#![cfg_attr(not(feature = "std"), no_std)]
+
+use snowbridge_core::AgentId;
+use xcm::VersionedLocation;
+
+sp_api::decl_runtime_apis! {
+	pub trait ControlApi
+	{
+		fn agent_id(location: VersionedLocation) -> Option<AgentId>;
+	}
+}