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/inbound-queue/src/envelope.rs

@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
+use snowbridge_core::{inbound::Log, ChannelId};
+
+use sp_core::{RuntimeDebug, H160, H256};
+use sp_std::{convert::TryFrom, prelude::*};
+
+use alloy_primitives::B256;
+use alloy_sol_types::{sol, SolEvent};
+
+sol! {
+	event OutboundMessageAccepted(bytes32 indexed channel_id, uint64 nonce, bytes32 indexed message_id, bytes payload);
+}
+
+/// An inbound message that has had its outer envelope decoded.
+#[derive(Clone, RuntimeDebug)]
+pub struct Envelope {
+	/// The address of the outbound queue on Ethereum that emitted this message as an event log
+	pub gateway: H160,
+	/// The message Channel
+	pub channel_id: ChannelId,
+	/// A nonce for enforcing replay protection and ordering.
+	pub nonce: u64,
+	/// An id for tracing the message on its route (has no role in bridge consensus)
+	pub message_id: H256,
+	/// The inner payload generated from the source application.
+	pub payload: Vec<u8>,
+}
+
+#[derive(Copy, Clone, RuntimeDebug)]
+pub struct EnvelopeDecodeError;
+
+impl TryFrom<&Log> for Envelope {
+	type Error = EnvelopeDecodeError;
+
+	fn try_from(log: &Log) -> Result<Self, Self::Error> {
+		let topics: Vec<B256> = log.topics.iter().map(|x| B256::from_slice(x.as_ref())).collect();
+
+		let event = OutboundMessageAccepted::decode_log(topics, &log.data, true)
+			.map_err(|_| EnvelopeDecodeError)?;
+
+		Ok(Self {
+			gateway: log.address,
+			channel_id: ChannelId::from(event.channel_id.as_ref()),
+			nonce: event.nonce,
+			message_id: H256::from(event.message_id.as_ref()),
+			payload: event.payload,
+		})
+	}
+}