[typescript] add abort signal to requestcontext (#21323)

* add abort signal to requestcontext

* regenerate

* rebuild and regenerate

* abort signal import

* refresh samples

* clean csharp samples

* csharp sample cleanup

* add missing cs samples from master

* abort testing

samples/client/echo_api/typescript/build/http/http.ts

@@ -3,6 +3,7 @@ import * as FormData from "form-data";
 import { URL, URLSearchParams } from 'url';
 import * as http from 'http';
 import * as https from 'https';
+import { AbortSignal } from "node-fetch/externals";
 import { Observable, from } from '../rxjsStub';
 
 export * from './isomorphic-fetch';
@@ -57,6 +58,7 @@ export class RequestContext {
     private headers: Headers = {};
     private body: RequestBody = undefined;
     private url: URL;
+    private signal: AbortSignal | undefined = undefined;
     private agent: http.Agent | https.Agent | undefined = undefined;
 
     /**
@@ -135,6 +137,15 @@ export class RequestContext {
         this.headers[key] = value;
     }
 
+    public setSignal(signal: AbortSignal): void {
+        this.signal = signal;
+    }
+
+    public getSignal(): AbortSignal | undefined {
+        return this.signal;
+    }
+
+
     public setAgent(agent: http.Agent | https.Agent) {
         this.agent = agent;
     }

samples/client/echo_api/typescript/build/http/isomorphic-fetch.ts

@@ -12,6 +12,7 @@ export class IsomorphicFetchHttpLibrary implements HttpLibrary {
             method: method,
             body: body as any,
             headers: request.getHeaders(),
+            signal: request.getSignal(),
             agent: request.getAgent(),
         }).then((resp: any) => {
             const headers: { [name: string]: string } = {};