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/src/api.rs

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
+//! Helpers for implementing runtime api
+
+use snowbridge_core::AgentId;
+use xcm::{prelude::*, VersionedLocation};
+
+use crate::{agent_id_of, Config};
+
+pub fn agent_id<Runtime>(location: VersionedLocation) -> Option<AgentId>
+where
+	Runtime: Config,
+{
+	let location: Location = location.try_into().ok()?;
+	agent_id_of::<Runtime>(&location).ok()
+}