feat(pulse): add pulse contracts

target_chains/ethereum/contracts/contracts/pulse/IPulse.sol

@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: Apache 2
+
+pragma solidity ^0.8.0;
+
+import "./PulseEvents.sol";
+import "./PulseState.sol";
+
+interface IPulseConsumer {
+    function pulseCallback(
+        uint64 sequenceNumber,
+        address provider,
+        uint256 publishTime,
+        bytes32[] calldata priceIds
+    ) external;
+}
+
+interface IPulse is PulseEvents {
+    // Core functions
+    function requestPriceUpdatesWithCallback(
+        address provider,
+        uint256 publishTime,
+        bytes32[] calldata priceIds,
+        uint256 callbackGasLimit
+    ) external payable returns (uint64 sequenceNumber);
+
+    function executeCallback(
+        address provider,
+        uint64 sequenceNumber,
+        bytes32[] calldata priceIds,
+        bytes[] calldata updateData,
+        uint256 callbackGasLimit
+    ) external payable;
+
+    // Provider management
+    function register(
+        uint128 feeInWei,
+        uint128 feePerGas,
+        bytes calldata uri
+    ) external;
+
+    function setProviderFee(uint128 newFeeInWei) external;
+
+    function setProviderFeeAsFeeManager(
+        address provider,
+        uint128 newFeeInWei
+    ) external;
+
+    function setProviderUri(bytes calldata uri) external;
+
+    function withdraw(uint128 amount) external;
+
+    function withdrawAsFeeManager(address provider, uint128 amount) external;
+
+    // Getters
+    function getFee(
+        address provider,
+        uint256 callbackGasLimit
+    ) external view returns (uint128 feeAmount);
+
+    function getPythFeeInWei() external view returns (uint128 pythFeeInWei);
+
+    function getAccruedPythFees()
+        external
+        view
+        returns (uint128 accruedPythFeesInWei);
+
+    function getDefaultProvider() external view returns (address);
+
+    function getProviderInfo(
+        address provider
+    ) external view returns (PulseState.ProviderInfo memory info);
+
+    function getRequest(
+        address provider,
+        uint64 sequenceNumber
+    ) external view returns (PulseState.Request memory req);
+
+    // Setters
+    function setFeeManager(address manager) external;
+
+    function setMaxNumPrices(uint32 maxNumPrices) external;
+}