Feat: Upload service

[jens-kuerten]

Add methods for uploading files to CIM Database Cloud via the Functions Access Service.

[Copilot]

Pull Request Overview

This PR adds file upload functionality to the Functions Access Service, expanding its capabilities beyond number generation to include methods for uploading files to the CIM Database Cloud.

Key changes:

• Refactored service architecture to use metadata-based initialization instead of direct URL/token parameters
• Added comprehensive file upload service with presigned URL support and chunked uploads
• Updated existing tests and added extensive test coverage for the new upload functionality

Reviewed Changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/test_service.py	Refactored existing tests to use MetaData objects and added comprehensive test suite for FileUploadService
pyproject.toml	Updated version and added type stubs for requests and PyYAML
mkdocs.yml	Added service documentation reference
docs/reference/service.md	Added comprehensive documentation for service API including file upload methods
csfunctions/service/numgen.py	Simplified by removing duplicate classes and importing from base module
csfunctions/service/file_upload_schemas.py	Added Pydantic models for file upload request/response schemas
csfunctions/service/file_upload.py	Implemented FileUploadService with chunked upload, error handling, and abort functionality
csfunctions/service/base.py	Created base service class with metadata-based initialization and enhanced error handling
csfunctions/service/__init__.py	Added service module initialization with proper exports
csfunctions/handler.py	Updated to use metadata-based service initialization

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