Initial setup around GitHub API mock server (#1629)

extensions/ql-vscode/package.json

@@ -1330,6 +1330,7 @@
     "mini-css-extract-plugin": "^2.6.1",
     "mocha": "^10.0.0",
     "mocha-sinon": "~2.1.2",
+    "msw": "^0.47.4",
     "npm-run-all": "^4.1.5",
     "prettier": "~2.0.5",
     "proxyquire": "~2.1.3",

extensions/ql-vscode/src/mocks/mock-gh-api-server.ts

@@ -0,0 +1,24 @@
+/**
+ * Enables mocking of the GitHub API server via HTTP interception, using msw.
+ */
+export class MockGitHubApiServer {
+  public startServer(): void {
+    // TODO: Enable HTTP interception.
+  }
+
+  public stopServer(): void {
+    // Disable HTTP interception.
+  }
+
+  public loadScenario(): void {
+    // TODO: Implement logic to load a scenario from a directory.
+  }
+
+  public listScenarios(): void {
+    // TODO: Implement logic to list all available scenarios.
+  }
+
+  public recordScenario(): void {
+    // TODO: Implement logic to record a new scenario to a directory.
+  }
+}