add NativeDeposited event to LM#receive() function (#1001)

## Motivation
https://smartcontract-it.atlassian.net/browse/LM-38


## Solution
Add the event

contracts/.changeset/flat-bikes-greet.md

@@ -0,0 +1,5 @@
+---
+'@chainlink/contracts-ccip': patch
+---
+
+add LM event to receive() function

contracts/gas-snapshots/liquiditymanager.gas-snapshot

@@ -2,11 +2,12 @@ LiquidityManager__report:test_EmptyReportReverts() (gas: 11159)
 LiquidityManager_addLiquidity:test_addLiquiditySuccess() (gas: 279154)
 LiquidityManager_rebalanceLiquidity:test_InsufficientLiquidityReverts() (gas: 19585)
 LiquidityManager_rebalanceLiquidity:test_InvalidRemoteChainReverts() (gas: 190304)
-LiquidityManager_rebalanceLiquidity:test_rebalanceBetweenPoolsSuccess() (gas: 8809026)
-LiquidityManager_rebalanceLiquidity:test_rebalanceBetweenPoolsSuccess_AlreadyFinalized() (gas: 8731220)
-LiquidityManager_rebalanceLiquidity:test_rebalanceBetweenPools_MultiStageFinalization() (gas: 8726428)
-LiquidityManager_rebalanceLiquidity:test_rebalanceBetweenPools_NativeRewrap() (gas: 8653242)
+LiquidityManager_rebalanceLiquidity:test_rebalanceBetweenPoolsSuccess() (gas: 8831482)
+LiquidityManager_rebalanceLiquidity:test_rebalanceBetweenPoolsSuccess_AlreadyFinalized() (gas: 8742448)
+LiquidityManager_rebalanceLiquidity:test_rebalanceBetweenPools_MultiStageFinalization() (gas: 8737656)
+LiquidityManager_rebalanceLiquidity:test_rebalanceBetweenPools_NativeRewrap() (gas: 8665799)
 LiquidityManager_rebalanceLiquidity:test_rebalanceLiquiditySuccess() (gas: 379308)
+LiquidityManager_receive:test_receive_success() (gas: 21182)
 LiquidityManager_removeLiquidity:test_InsufficientLiquidityReverts() (gas: 184481)
 LiquidityManager_removeLiquidity:test_OnlyOwnerReverts() (gas: 10967)
 LiquidityManager_removeLiquidity:test_removeLiquiditySuccess() (gas: 236047)

contracts/src/v0.8/liquiditymanager/LiquidityManager.sol

@@ -85,6 +85,11 @@ contract LiquidityManager is ILiquidityManager, OCR3Base {
   /// @param newBalance The new minimum liquidity.
   event MinimumLiquiditySet(uint256 oldBalance, uint256 newBalance);
 
+  /// @notice Emitted when someone sends native to this contract
+  /// @param amount The amount of native deposited
+  /// @param depositor The address that deposited the native
+  event NativeDeposited(uint256 amount, address depositor);
+
   /// @notice Emitted when native balance is withdrawn by contract owner
   /// @param amount The amount of native withdrawn
   /// @param destination The address the native is sent to
@@ -167,7 +172,9 @@ contract LiquidityManager is ILiquidityManager, OCR3Base {
   // │                      Native Management                       │
   // ================================================================
 
-  receive() external payable {}
+  receive() external payable {
+    emit NativeDeposited(msg.value, msg.sender);
+  }
 
   /// @notice withdraw native balance
   function withdrawNative(uint256 amount, address payable destination) external onlyOwner {

contracts/src/v0.8/liquiditymanager/bridge-adapters/ArbitrumL2BridgeAdapter.sol

@@ -63,7 +63,7 @@ contract ArbitrumL2BridgeAdapter is IBridgeAdapter {
     address /* remoteSender */,
     address /* localReceiver */,
     bytes calldata /* bridgeSpecificPayload */
-  ) external override returns (bool) {
+  ) external pure override returns (bool) {
     return true;
   }
 

contracts/src/v0.8/liquiditymanager/bridge-adapters/OptimismL2BridgeAdapter.sol

@@ -96,7 +96,7 @@ contract OptimismL2BridgeAdapter is IBridgeAdapter {
     address /* remoteSender */,
     address /* localReceiver */,
     bytes calldata /* bridgeSpecificPayload */
-  ) external override returns (bool) {
+  ) external pure override returns (bool) {
     return true;
   }
 

contracts/src/v0.8/liquiditymanager/test/LiquidityManager.t.sol

@@ -864,3 +864,19 @@ contract LiquidityManager_withdrawNative is LiquidityManagerSetup {
     s_liquidityManager.withdrawNative(1, payable(receiver));
   }
 }
+
+contract LiquidityManager_receive is LiquidityManagerSetup {
+  event NativeDeposited(uint256 amount, address depositor);
+
+  address private depositor = makeAddr("depositor");
+
+  function test_receive_success() external {
+    vm.deal(depositor, 100);
+    uint256 before = address(s_liquidityManager).balance;
+    vm.expectEmit();
+    emit NativeDeposited(100, depositor);
+    vm.startPrank(depositor);
+    payable(address(s_liquidityManager)).transfer(100);
+    assertEq(address(s_liquidityManager).balance, before + 100);
+  }
+}

contracts/src/v0.8/liquiditymanager/test/mocks/MockBridgeAdapter.sol

@@ -185,7 +185,7 @@ contract MockL2BridgeAdapter is IBridgeAdapter {
     address /* remoteSender */,
     address /* localReceiver */,
     bytes calldata /* bridgeSpecificData */
-  ) external override returns (bool) {
+  ) external pure override returns (bool) {
     return true;
   }
 }