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/ethereum-client/src/functions.rs

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
+use crate::config::{
+	EPOCHS_PER_SYNC_COMMITTEE_PERIOD, SLOTS_PER_EPOCH, SYNC_COMMITTEE_BITS_SIZE,
+	SYNC_COMMITTEE_SIZE,
+};
+
+/// Decompress packed bitvector into byte vector according to SSZ deserialization rules. Each byte
+/// in the decompressed vector is either 0 or 1.
+pub fn decompress_sync_committee_bits(
+	input: [u8; SYNC_COMMITTEE_BITS_SIZE],
+) -> [u8; SYNC_COMMITTEE_SIZE] {
+	primitives::decompress_sync_committee_bits::<SYNC_COMMITTEE_SIZE, SYNC_COMMITTEE_BITS_SIZE>(
+		input,
+	)
+}
+
+/// Compute the sync committee period in which a slot is contained.
+pub fn compute_period(slot: u64) -> u64 {
+	slot / SLOTS_PER_EPOCH as u64 / EPOCHS_PER_SYNC_COMMITTEE_PERIOD as u64
+}
+
+/// Compute epoch in which a slot is contained.
+pub fn compute_epoch(slot: u64, slots_per_epoch: u64) -> u64 {
+	slot / slots_per_epoch
+}
+
+/// Sums the bit vector of sync committee participation.
+pub fn sync_committee_sum(sync_committee_bits: &[u8]) -> u32 {
+	sync_committee_bits.iter().fold(0, |acc: u32, x| acc + *x as u32)
+}