feat: add nft list page v2 feature flag (#5801)

* add nft list page v2 feature flag

* add new flag file
Co-authored-by: Charles Bachmeier <charlie@genie.xyz>

src/components/FeatureFlagModal/FeatureFlagModal.tsx

 import { BaseVariant, FeatureFlag, featureFlagSettings, useUpdateFlag } from 'featureFlags'
 import { useFiatOnrampFlag } from 'featureFlags/flags/fiatOnramp'
+import { NftListV2Variant, useNftListV2Flag } from 'featureFlags/flags/nftListV2'
 import { Permit2Variant, usePermit2Flag } from 'featureFlags/flags/permit2'
 import { TraceJsonRpcVariant, useTraceJsonRpcFlag } from 'featureFlags/flags/traceJsonRpc'
 import { useAtomValue, useUpdateAtom } from 'jotai/utils'
@@ -215,6 +216,12 @@ export default function FeatureFlagModal() {
         featureFlag={FeatureFlag.fiatOnramp}
         label="Fiat on-ramp"
       />
+      <FeatureFlagOption
+        variant={NftListV2Variant}
+        value={useNftListV2Flag()}
+        featureFlag={FeatureFlag.nftListV2}
+        label="NFT Listing Page v2"
+      />
       <FeatureFlagGroup name="Debug">
         <FeatureFlagOption
           variant={TraceJsonRpcVariant}

src/featureFlags/flags/featureFlags.ts

@@ -2,4 +2,5 @@ export enum FeatureFlag {
   fiatOnramp = 'fiatOnramp',
   traceJsonRpc = 'traceJsonRpc',
   permit2 = 'permit2',
+  nftListV2 = 'nftListV2',
 }

src/featureFlags/flags/nftListV2.ts

+import { BaseVariant, FeatureFlag, useBaseFlag } from '../index'
+
+export function useNftListV2Flag(): BaseVariant {
+  return useBaseFlag(FeatureFlag.nftListV2)
+}
+
+export { BaseVariant as NftListV2Variant }