Add new Boundary Node NnsFunctions (#537)

# Motivation

Extend NnsFunctions enum with new BoundaryNodes related types.

`nns-dapp` related pr dfinity/nns-dapp#4310

# Changes

- NnsFunctions update

# Tests

Works

# Todos

- [ ] Add entry to changelog (if necessary).
Not necessary

packages/nns/src/enums/governance.enums.ts

@@ -125,6 +125,9 @@ export enum NnsFunction {
   BitcoinSetConfig = 39,
   UpdateElectedHostosVersions = 40,
   UpdateNodesHostosVersion = 41,
+  AddApiBoundaryNode = 43,
+  RemoveApiBoundaryNodes = 44,
+  UpdateApiBoundaryNodesVersion = 46,
 }
 
 // Reference: https://github.com/dfinity/ic/blob/f4b2e28525ae9b030bd9edfc982e796417db2b80/rs/nns/governance/src/gen/ic_nns_governance.pb.v1.rs#L3286-L3287