Introduce the @backstage/errors package.

Encode thrown errors in the backend as a JSON payload using a facility in that package, and render helpful frontend displays of those errors.

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

packages/create-app/package.json

@@ -50,6 +50,7 @@
     "@backstage/cli": "*",
     "@backstage/config": "*",
     "@backstage/core": "*",
+    "@backstage/errors": "*",
     "@backstage/plugin-api-docs": "*",
     "@backstage/plugin-app-backend": "*",
     "@backstage/plugin-auth-backend": "*",

packages/create-app/src/lib/versions.ts

@@ -36,6 +36,7 @@ import { version as catalogModel } from '../../../catalog-model/package.json';
 import { version as cli } from '../../../cli/package.json';
 import { version as config } from '../../../config/package.json';
 import { version as core } from '../../../core/package.json';
+import { version as errors } from '../../../errors/package.json';
 import { version as testUtils } from '../../../test-utils/package.json';
 import { version as theme } from '../../../theme/package.json';
 
@@ -67,6 +68,7 @@ export const packageVersions = {
   '@backstage/cli': cli,
   '@backstage/config': config,
   '@backstage/core': core,
+  '@backstage/errors': errors,
   '@backstage/plugin-api-docs': pluginApiDocs,
   '@backstage/plugin-app-backend': pluginAppBackend,
   '@backstage/plugin-auth-backend': pluginAuthBackend,