feat: configure lti exam providers (#356)

Allows setting a course exam provider to integrations managed by edx-exams. This option is gated by the CourseWaffleFlag course_apps.exams_ida in edx-platform.

src/data/services/ExamsApiService.js

@@ -0,0 +1,34 @@
+import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
+import { getConfig } from '@edx/frontend-platform';
+
+class ExamsApiService {
+  static isAvailable() {
+    return !!this.getExamsBaseUrl();
+  }
+
+  static getExamsBaseUrl() {
+    return getConfig().EXAMS_BASE_URL;
+  }
+
+  static getExamConfigurationUrl(courseId) {
+    return `${ExamsApiService.getExamsBaseUrl()}/api/v1/configs/course_id/${courseId}`;
+  }
+
+  static getAvailableProviders() {
+    const apiClient = getAuthenticatedHttpClient();
+    const providersUrl = `${ExamsApiService.getExamsBaseUrl()}/api/v1/providers`;
+    return apiClient.get(providersUrl);
+  }
+
+  static getCourseExamConfiguration(courseId) {
+    const apiClient = getAuthenticatedHttpClient();
+    return apiClient.get(this.getExamConfigurationUrl(courseId));
+  }
+
+  static saveCourseExamConfiguration(courseId, dataToSave) {
+    const apiClient = getAuthenticatedHttpClient();
+    return apiClient.patch(this.getExamConfigurationUrl(courseId), dataToSave);
+  }
+}
+
+export default ExamsApiService;