feat(server): add Blob Model (#12894)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Introduced comprehensive management for workspace blobs, including
creating, updating, soft and permanent deletion, and retrieval of blobs.
- Added the ability to list all blobs, list deleted blobs, and calculate
the total size of blobs within a workspace.

- **Tests**
- Added extensive automated tests to validate blob creation, updating,
deletion, retrieval, and aggregation functionalities.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->


#### PR Dependency Tree


* **PR #12894** 👈
  * **PR #12897**

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

packages/backend/server/src/models/index.ts

@@ -7,6 +7,7 @@ import {
 import { ModuleRef } from '@nestjs/core';
 
 import { ApplyType } from '../base';
+import { BlobModel } from './blob';
 import { CommentModel } from './comment';
 import { CommentAttachmentModel } from './comment-attachment';
 import { AppConfigModel } from './config';
@@ -52,6 +53,7 @@ const MODELS = {
   appConfig: AppConfigModel,
   comment: CommentModel,
   commentAttachment: CommentAttachmentModel,
+  blob: BlobModel,
 };
 
 type ModelsType = {
@@ -103,6 +105,7 @@ const ModelsSymbolProvider: ExistingProvider = {
 })
 export class ModelsModule {}
 
+export * from './blob';
 export * from './comment';
 export * from './comment-attachment';
 export * from './common';