feat: currency conversion feature flag (#7123)

* feat: currency conversion feature flag

* removing eslint

src/components/FeatureFlagModal/FeatureFlagModal.tsx

 import { BaseVariant, FeatureFlag, featureFlagSettings, useUpdateFlag } from 'featureFlags'
+import { useCurrencyConversionFlag } from 'featureFlags/flags/currencyConversion'
 import { useForceUniswapXOnFlag } from 'featureFlags/flags/forceUniswapXOn'
 import { useMultichainUXFlag } from 'featureFlags/flags/multichainUx'
 import { useRoutingAPIForPriceFlag } from 'featureFlags/flags/priceRoutingApi'
@@ -236,6 +237,12 @@ export default function FeatureFlagModal() {
         featureFlag={FeatureFlag.routingAPIPrice}
         label="Use the routing-api v2 for price fetches"
       />
+      <FeatureFlagOption
+        variant={BaseVariant}
+        value={useCurrencyConversionFlag()}
+        featureFlag={FeatureFlag.currencyConversion}
+        label="Enable currency conversion"
+      />
       <FeatureFlagOption
         variant={BaseVariant}
         value={useMultichainUXFlag()}

src/featureFlags/flags/currencyConversion.ts

+import { BaseVariant, FeatureFlag, useBaseFlag } from '../index'
+
+export function useCurrencyConversionFlag(): BaseVariant {
+  return useBaseFlag(FeatureFlag.currencyConversion)
+}

src/featureFlags/index.tsx

@@ -16,6 +16,7 @@ export enum FeatureFlag {
   forceUniswapXOn = 'uniswapx_force_on', // forces routing-api's feature flag for uniswapx to turn on as well
   uniswapXEthOutputEnabled = 'uniswapx_eth_output_enabled',
   multichainUX = 'multichain_ux',
+  currencyConversion = 'currency_conversion',
 }
 
 interface FeatureFlagsContextType {