fix(sdk-coin-cosmos): utils and cosmosSharedCoin fixes

TICKET: COIN-4881

- Addition of validDenoms in CosmosNetwork interface
- Fixing denom validation in utils
- Addition of staticsCoin in CosmosSharedCoin

Author: baltiyal

modules/sdk-coin-cosmos/src/cosmosSharedCoin.ts

@@ -9,15 +9,16 @@ import { KeyPair, Utils, TransactionBuilderFactory } from './lib';
  * instead of requiring individual coin modules
  */
 export class CosmosSharedCoin extends CosmosCoin {
-  private readonly _network: CosmosNetwork;
+  protected readonly _staticsCoin: Readonly<StaticsBaseCoin>;
+  protected readonly _network: CosmosNetwork;
 
   protected constructor(bitgo: BitGoBase, staticsCoin?: Readonly<StaticsBaseCoin>) {
     super(bitgo, staticsCoin);
 
     if (!staticsCoin) {
       throw new Error('missing required constructor parameter staticsCoin');
     }
-
+    this._staticsCoin = staticsCoin;
     // Get the network configuration from statics
     const network = staticsCoin.network as CosmosNetwork;
     if (!network || !network.addressPrefix || !network.validatorPrefix) {

modules/sdk-coin-cosmos/src/lib/utils.ts

@@ -44,10 +44,8 @@ export class Utils extends CosmosUtils {
     if (!amount?.denom) {
       throw new InvalidTransactionError('Invalid amount: missing denom');
     }
-    if (amount.denom !== this._network.denom) {
-      throw new InvalidTransactionError(
-        `Invalid amount: denom '${amount.denom}' does not match network denom '${this._network.denom}'`
-      );
+    if (!this._network.validDenoms.includes(amount.denom)) {
+      throw new InvalidTransactionError(`Invalid amount: denom '${amount.denom}' is not a valid denomination`);
     }
     if (!amount?.amount) {
       throw new InvalidTransactionError('Invalid amount: missing amount');

modules/statics/src/networks.ts

@@ -85,6 +85,7 @@ export interface CosmosNetwork extends AccountNetwork {
   readonly denom: string;
   readonly gasAmount: string;
   readonly gasLimit: number;
+  readonly validDenoms: string[];
 }
 
 /**