feat(server): runtime setting support (#5602)

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<details open="true"><summary>Generated summary (powered by <a href="https://app.graphite.dev">Graphite</a>)</summary>

> ## TL;DR
> This pull request adds a new migration file, a new model, and new modules related to runtime settings. It also introduces a new `Runtime` service that allows getting, setting, and updating runtime configurations.
>
> ## What changed
> - Added a new migration file `migration.sql` that creates a table called `application_settings` with columns `key` and `value`.
> - Added a new model `ApplicationSetting` with properties `key` and `value`.
> - Added a new module `RuntimeSettingModule` that exports the `Runtime` service.
> - Added a new service `Runtime` that provides methods for getting, setting, and updating runtime configurations.
> - Modified the `app.module.ts` file to import the `RuntimeSettingModule`.
> - Modified the `index.ts` file in the `fundamentals` directory to export the `Runtime` service.
> - Added a new file `def.ts` in the `runtime` directory that defines the runtime configurations and provides a default implementation.
> - Added a new file `service.ts` in the `runtime` directory that implements the `Runtime` service.
>
> ## How to test
> 1. Run the migration script to create the `application_settings` table.
> 2. Use the `Runtime` service to get, set, and update runtime configurations.
> 3. Verify that the runtime configurations are stored correctly in the database and can be retrieved and modified using the `Runtime` service.
>
> ## Why make this change
> This change introduces a new feature related to runtime settings. The `Runtime` service allows the application to dynamically manage and modify runtime configurations without requiring a restart. This provides flexibility and allows for easier customization and configuration of the application.
</details>

packages/backend/server/tests/feature.spec.ts

@@ -15,7 +15,7 @@ import {
 import { UserType } from '../src/core/user/types';
 import { WorkspaceResolver } from '../src/core/workspaces/resolvers';
 import { Permission } from '../src/core/workspaces/types';
-import { ConfigModule } from '../src/fundamentals/config';
+import { Config, ConfigModule } from '../src/fundamentals/config';
 import { createTestingApp } from './utils';
 
 @Injectable()
@@ -51,10 +51,9 @@ test.beforeEach(async t => {
   const { app } = await createTestingApp({
     imports: [
       ConfigModule.forRoot({
-        host: 'example.org',
-        https: true,
-        featureFlags: {
-          earlyAccessPreview: true,
+        server: {
+          host: 'example.org',
+          https: true,
         },
       }),
       FeatureModule,
@@ -67,6 +66,8 @@ test.beforeEach(async t => {
     },
   });
 
+  const config = app.get(Config);
+  await config.runtime.set('flags/earlyAccessControl', true);
   t.context.app = app;
   t.context.auth = app.get(AuthService);
   t.context.feature = app.get(FeatureService);