create an axios config for api token for extensibility

src/client/lcd/APIRequester.ts

@@ -1,5 +1,6 @@
 import Axios, { AxiosInstance } from 'axios';
 import { OrderBy as OrderBy_pb } from '@terra-money/legacy.proto/cosmos/tx/v1beta1/service';
+import { AxiosConfig } from './LCDClient';
 
 export type APIParams = Record<string, string | number | null | undefined>;
 
@@ -24,14 +25,14 @@ export class APIRequester {
   private axios: AxiosInstance;
   private readonly baseURL: string;
 
-  constructor(baseURL: string, apiToken?: string) {
+  constructor(baseURL: string, axiosConfig?: AxiosConfig) {
     this.baseURL = baseURL;
 
-    if (apiToken) {
+    if (axiosConfig?.apiToken) {
       this.axios = Axios.create({
         headers: {
           Accept: 'application/json',
-          Authorization: `Bearer ${apiToken}`,
+          Authorization: `Bearer ${axiosConfig.apiToken}`,
         },
         timeout: 30000,
       });

src/client/lcd/LCDClient.ts

@@ -28,16 +28,23 @@ import { GovV1API } from './api/GovV1API';
 import { ICAv1API } from './api/ICAv1API';
 import { ICQv1API } from './api/ICQv1API';
 
+export type AxiosConfig = {
+  /**
+   * The API key to be included in requests sent to the LCD.
+   */
+  apiToken?: string;
+};
+
 export interface LCDClientConfig {
   /**
-   * The base URL to which LCD requests will be made.
+   * The Axios configuration to use when making requests to the LCD.
    */
-  lcd: string;
+  axiosConfig?: AxiosConfig;
 
   /**
-   * The API key to be included in requests sent to the LCD.
+   * The base URL to which LCD requests will be made.
    */
-  apiToken?: string;
+  lcd: string;
 
   /**
    * Chain ID of the blockchain to connect to.
@@ -149,7 +156,7 @@ export class LCDClient {
       (result: Record<string, APIRequester>, chainID) => {
         result[chainID] = new APIRequester(
           chains[chainID].lcd,
-          chains[chainID].apiToken
+          chains[chainID].axiosConfig
         );
         return result;
       },