Merge pull request #2806 from keep-network/backport-new-allocation

[Backport] tBTC reward allocation 2021-12-21 -> 2022-01-22

Adding tBTC rewards merkle tree.

Also adjusts the tBTC Rewards page to the proposal that extends stakedrop 
rewards for an additional 4 months. We will have two more allocations so to 
simplify calculating the period of the reward we hardcoded the merkleRoot in 
the ExtendedECDSARewards.intervalsDates array. After generating the new merkle 
tree we must add the merkleRoot hash to a given interval.

solidity-v1/dashboard/src/pages/rewards/TBTCRewardsPage.jsx

@@ -8,7 +8,7 @@ import { SubmitButton } from "../../components/Button"
 // import ProgressBar from "../../components/ProgressBar"
 import Timer from "../../components/Timer"
 import TBTCRewardsDataTable from "../../components/TBTCRewardsDataTable"
-import { ECDSARewardsHelper } from "../../utils/rewardsHelper"
+import { ExtendedECDSARewardsHelper } from "../../utils/rewardsHelper"
 import { useWeb3Address } from "../../components/WithWeb3Context"
 import {
   TokenAmountSkeleton,
@@ -22,9 +22,9 @@ import EmptyStatePage from "./EmptyStatePage"
 const TBTCRewardsPage = () => {
   const dispatch = useDispatch()
   const yourAddress = useWeb3Address()
-  const currentIntervalEndOf = ECDSARewardsHelper.intervalEndOf(
-    ECDSARewardsHelper.currentInterval
-  ).unix()
+  const currentIntervalEndOf = ExtendedECDSARewardsHelper.intervalEndOf(
+    ExtendedECDSARewardsHelper.currentInterval
+  )
 
   const {
     ecdsaAvailableRewardsFetching,
@@ -78,7 +78,8 @@ const TBTCRewardsPage = () => {
 
 const RewardsOverview = ({ balance, isBalanceFetching, withdrawRewards }) => {
   const remainingPeriods =
-    ECDSARewardsHelper.intervals - ECDSARewardsHelper.currentInterval
+    ExtendedECDSARewardsHelper.intervals -
+    ExtendedECDSARewardsHelper.currentInterval
 
   return (
     <section className="tile rewards__overview--tbtc">
@@ -93,7 +94,9 @@ const RewardsOverview = ({ balance, isBalanceFetching, withdrawRewards }) => {
       <div className="rewards__overview__period">
         <h5 className="text-grey-70">current rewards period</h5>
         <span className="rewards-period__date">
-          {ECDSARewardsHelper.periodOf(ECDSARewardsHelper.currentInterval)}
+          {ExtendedECDSARewardsHelper.periodOf(
+            ExtendedECDSARewardsHelper.currentInterval
+          )}
         </span>
         <div className="rewards-period__remaining-periods">
           <Icons.Time width="16" height="16" className="time-icon--grey-30" />