Stage version of Rewards V2 (#12)

* Preliminary CometRewardsV2 functionality with MerkleProof

* feat: restructorized contract storage, fixed all compilaion errors

* fix: multiple assets compaign

* fix: compaigns functionality

* feat: Add finishAccrued and startAccrued bug fix (#5)

* feat: claimed calculation fix

* feat: claimed calculation fix

* feat: add CometRewards V1 interaction

* wip: tests and new contract version

* wip: contract update with more tests

* wip: new contract update and revert changes to CometRewards

* wip: cover most of the contract and fix some bugs

* wip: coverage improvement

* feat: complited contract changes and test coverage

* feat: remove package-lock

* feat: set yarn file to the main branch version

* feat: update yarn file

.solcover.js

@@ -1,3 +1,8 @@
 module.exports = {
-  skipFiles: ['test/', 'vendor/', 'ERC20.sol']
-};
+  configureYulOptimizer: true, // (Experimental). Should resolve 'stack too deep' in projects using ABIEncoderV2.
+  skipFiles: ['test/', 'vendor/', 'ERC20.col'],
+  mocha: {
+      fgrep: '[skip-on-coverage]',
+      invert: true
+  }
+};

contracts/CometRewardsInterface.sol

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity 0.8.15;
+
+/**
+ * @title Compound's CometRewards Interface
+ * @notice An efficient monolithic money market protocol
+ * @author Compound
+ */
+abstract contract CometRewardsInterface {
+    struct RewardOwed {
+        address token;
+        uint owed;
+    }
+
+    function getRewardOwed(address comet, address account) virtual external returns (RewardOwed memory);
+    function claim(address comet, address src, bool shouldAccrue) virtual external;
+    function claimTo(address comet, address src, address to, bool shouldAccrue) virtual external;
+}