Disable bodyTimeout and headersTimeout when CLI fetching from backend

Fixes bug where CLI would crash if the chain took more than 5 minutes to
process.

package.json

@@ -140,6 +140,7 @@
     "scheduler": "^0.22.0",
     "semver": "^7.3.7",
     "systeminformation": "^5.11.16",
+    "undici": "^5.22.1",
     "use-context-selector": "^1.4.0",
     "use-debounce": "^8.0.1",
     "use-http": "^1.0.26",

src/common/Backend.ts

@@ -1,3 +1,4 @@
+import { fetch as undiciFetch, Agent as undiciAgent } from 'undici';
 import {
     BackendJsonNode,
     Category,
@@ -10,6 +11,7 @@ import {
     SchemaId,
 } from './common-types';
 import { Package } from './dependencies';
+import { isRenderer } from './env'
 
 export interface BackendSuccessResponse {
     type: 'success';
@@ -103,7 +105,12 @@ export class Backend {
     }
 
     private async fetchJson<T>(path: string, method: 'POST' | 'GET', json?: unknown): Promise<T> {
-        const options: RequestInit = { method, cache: 'no-cache' };
+        const options: RequestInit = isRenderer ?
+            { method, cache: 'no-cache' } :
+            { method, cache: 'no-cache',
+              dispatcher: new undiciAgent({
+                  bodyTimeout: 0,
+                  headersTimeout: 0}) };
         const { signal } = this.abortController;
         if (json !== undefined) {
             options.body = JSON.stringify(json);
@@ -112,8 +119,7 @@ export class Backend {
             };
             options.signal = signal;
         }
-
-        const resp = await fetch(`http://127.0.0.1:${this.port}${path}`, options);
+        const resp = await (isRenderer ? fetch : undiciFetch)(`http://127.0.0.1:${this.port}${path}`, options);
         return (await resp.json()) as T;
     }