Adds check empty file upload and tests added tests for file upload.

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Commits
Files that changed from the base of the PR and between 66c734b5a960afbd5d80e14942093d026a762c92 and 5ef09b16314e7259e55bd9ccf914d64886d625e8.

Walkthrough

The recent update improves the robustness of the file upload functionality, adding checks for empty file uploads to enhance resource efficiency and data integrity. It includes revisions across multiple files to support these features and expands test coverage to ensure correct behavior.

Changes

File Path	Change Summary
`CONTRIBUTING.md`	Added an extra blank line at the beginning.
`.../controllers/file-upload.controller.ts`	Added a file size check before the file upload operation to return an error response if the file size is 0.
`.../interceptors/file-upload.interceptor.ts`	Added `request.raw = request.raw \|\| request` before invoking `this.multer.single(fieldName)`.
`.../interfaces/file-upload.interface.ts`	Added `size: number;` and `buffer: Buffer;` properties to the `MultipartFile` interface.
`.../test/app.e2e-spec.ts`	Added imports for `fs` and `path`, modified response expectations for the root endpoint, and added tests for file uploads with content and empty files.
`sample/06-file-upload/test/app.e2e-spec.ts`	Added imports for `fs` and `path`, and test cases to handle file upload with content and empty files, ensuring appropriate response is returned for empty file upload.

Sequence Diagrams

File Upload Flow Before Changes

sequenceDiagram
    participant User
    participant Controller
    participant FilesService
    User->>Controller: Upload file
    Controller->>FilesService: Save file
    FilesService->>Controller: File saved
    Controller->>User: Success response

File Upload Flow After Changes

sequenceDiagram
    participant User
    participant Controller
    participant FilesService
    User->>Controller: Upload file
    Controller->>Controller: Check file size
    alt file size > 0
        Controller->>FilesService: Save file
        FilesService->>Controller: File saved
        Controller->>User: Success response
    else file size = 0
        Controller->>User: Error response
    end

Assessment against linked issues

Objective (Issue #)	Addressed	Explanation
Ensure empty file uploads are checked (### #156)	✅

Poem

In the world of bytes and megabytes, We now reject the empty sights. Files hefty or light, Must now have proper byte, To keep our uploads tight and right. 🎉🐇📂

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SamagraX-Stencil / stencil