Snowbridge: Synchronize from Snowfork repository (#3761)

This PR includes the following 2 improvements:

## Ethereum Client

Author: @yrong 
### Original Upstream PRs
- https://github.com/Snowfork/polkadot-sdk/pull/123
- https://github.com/Snowfork/polkadot-sdk/pull/125

### Description
The Ethereum client syncs beacon headers as they are finalized, and
imports every execution header. When a message is received, it is
verified against the import execution header. This is unnecessary, since
the execution header can be sent with the message as proof. The recent
Deneb Ethereum upgrade made it easier to locate the relevant beacon
header from an execution header, and so this improvement was made
possible. This resolves a concern @svyatonik had in our initial Rococo
PR:
https://github.com/paritytech/polkadot-sdk/pull/2522#discussion_r1431270691

## Inbound Queue

Author: @yrong 
### Original Upstream PR
- https://github.com/Snowfork/polkadot-sdk/pull/118

### Description
When the AH sovereign account (who pays relayer rewards) is depleted,
the inbound message will not fail. The relayer just will not receive
rewards.

Both these changes were done by @yrong, many thanks. ❤️

---------

Co-authored-by: claravanstaden <Cats 4 life!>
Co-authored-by: Ron <yrong1997@gmail.com>
Co-authored-by: Vincent Geddes <vincent@snowfork.com>
Co-authored-by: Svyatoslav Nikolsky <svyatonik@gmail.com>

bridges/snowbridge/primitives/core/src/inbound.rs

@@ -5,6 +5,7 @@
 use codec::{Decode, Encode};
 use frame_support::PalletError;
 use scale_info::TypeInfo;
+use snowbridge_beacon_primitives::{BeaconHeader, ExecutionProof};
 use sp_core::{H160, H256};
 use sp_runtime::RuntimeDebug;
 use sp_std::vec::Vec;
@@ -25,6 +26,8 @@ pub enum VerificationError {
 	InvalidLog,
 	/// Unable to verify the transaction receipt with the provided proof
 	InvalidProof,
+	/// Unable to verify the execution header with ancestry proof
+	InvalidExecutionProof(#[codec(skip)] &'static str),
 }
 
 pub type MessageNonce = u64;
@@ -65,10 +68,15 @@ impl Log {
 /// Inclusion proof for a transaction receipt
 #[derive(Clone, Encode, Decode, PartialEq, RuntimeDebug, TypeInfo)]
 pub struct Proof {
-	// The block hash of the block in which the receipt was included.
-	pub block_hash: H256,
-	// The index of the transaction (and receipt) within the block.
-	pub tx_index: u32,
 	// Proof keys and values (receipts tree)
-	pub data: (Vec<Vec<u8>>, Vec<Vec<u8>>),
+	pub receipt_proof: (Vec<Vec<u8>>, Vec<Vec<u8>>),
+	// Proof that an execution header was finalized by the beacon chain
+	pub execution_proof: ExecutionProof,
+}
+
+#[derive(Clone, RuntimeDebug)]
+pub struct InboundQueueFixture {
+	pub message: Message,
+	pub finalized_header: BeaconHeader,
+	pub block_roots_root: H256,
 }