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/src/schema.gql

@@ -60,7 +60,7 @@ input CreateCheckoutSessionInput {
   idempotencyKey: String!
   plan: SubscriptionPlan = Pro
   recurring: SubscriptionRecurring = Yearly
-  successCallbackLink: String
+  successCallbackLink: String!
 }
 
 type CredentialsRequirementType {
@@ -175,6 +175,11 @@ The `JSON` scalar type represents JSON values as specified by [ECMA-404](http://
 """
 scalar JSON @specifiedBy(url: "http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf")
 
+"""
+The `JSONObject` scalar type represents JSON objects as specified by [ECMA-404](http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf).
+"""
+scalar JSONObject @specifiedBy(url: "http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf")
+
 type LimitedUserType {
   """User email"""
   email: String!
@@ -234,6 +239,12 @@ type Mutation {
   setWorkspaceExperimentalFeature(enable: Boolean!, feature: FeatureType!, workspaceId: String!): Boolean!
   sharePage(pageId: String!, workspaceId: String!): Boolean! @deprecated(reason: "renamed to publishPage")
   updateProfile(input: UpdateUserInput!): UserType!
+
+  """update server runtime configurable setting"""
+  updateRuntimeConfig(id: String!, value: JSON!): ServerRuntimeConfigType!
+
+  """update multiple server runtime configurable settings"""
+  updateRuntimeConfigs(updates: JSONObject!): [ServerRuntimeConfigType!]!
   updateSubscriptionRecurring(idempotencyKey: String!, plan: SubscriptionPlan = Pro, recurring: SubscriptionRecurring!): UserSubscription!
 
   """Update workspace"""
@@ -291,6 +302,9 @@ type Query {
   """server config"""
   serverConfig: ServerConfigType!
 
+  """get all server runtime configurable settings"""
+  serverRuntimeConfig: [ServerRuntimeConfigType!]!
+
   """Get user by email"""
   user(email: String!): UserOrLimitedUser
 
@@ -323,6 +337,14 @@ type RemoveAvatar {
   success: Boolean!
 }
 
+enum RuntimeConfigType {
+  Array
+  Boolean
+  Number
+  Object
+  String
+}
+
 """
 The `SafeInt` scalar type represents non-fractional signed whole numeric values that are considered safe as defined by the ECMAScript specification.
 """
@@ -341,6 +363,9 @@ type ServerConfigType {
   """enabled server features"""
   features: [ServerFeature!]!
 
+  """server flags"""
+  flags: ServerFlagsType!
+
   """server flavor"""
   flavor: String! @deprecated(reason: "use `features`")
 
@@ -366,6 +391,21 @@ enum ServerFeature {
   Payment
 }
 
+type ServerFlagsType {
+  earlyAccessControl: Boolean!
+  syncClientVersionCheck: Boolean!
+}
+
+type ServerRuntimeConfigType {
+  description: String!
+  id: String!
+  key: String!
+  module: String!
+  type: RuntimeConfigType!
+  updatedAt: DateTime!
+  value: JSON!
+}
+
 enum SubscriptionPlan {
   AI
   Enterprise