feat: Complete SDK restructuring

[suyask-msft]

Major Changes:

• Restructured SDK into modular architecture for better scalability and maintainability
• Organized codebase into logical modules: core/, data/, utils/, models/, extensions/

SDK Structure Changes:

• core/: Authentication, configuration, HTTP client, and error handling
• data/: OData client, CRUD operations, SQL queries, and file uploads
• utils/: Pandas adapter and utility functions
• models/: Data models and type definitions (extensible)
• extensions/: Optional features like CLI and async clients (extensible)

Test Organization:

• Restructured tests into unit/, integration/, and fixtures/ folders
• Added comprehensive test infrastructure with conftest.py and test_data.py
• Organized unit tests by module: unit/core/, unit/data/, unit/utils/
• All 25 existing tests pass in new structure

Examples Reorganization:

• basic/: Getting started examples (quickstart.py)
• advanced/: Complex scenarios (pandas_integration.py, file_upload.py)
• integrations/: Microsoft service integrations (extensible)
• utilities/: Helper scripts and tools (extensible)

Import Path Updates:

• Updated all import paths to use new modular structure
• Maintained clean API surface through init.py files
• Client.py updated to import from new module locations

Benefits:

• Improved code organization and separation of concerns
• Faster CI/CD with targeted test execution
• Better developer experience with logical code grouping
• Scalable architecture ready for future SDK expansion
• Team-friendly structure for collaborative development

[Copilot]

Pull Request Overview

This PR reorganizes the Dataverse SDK codebase into a modular structure by separating code into distinct packages (core, data, utils, models, extensions), updating all import paths accordingly, and adding comprehensive documentation and test infrastructure.

Key Changes:

• Restructured package into core (auth, config, errors, http), data (odata, upload), utils (pandas_adapter), models, and extensions modules
• Updated all import paths throughout tests, examples, and source code to reflect new module structure
• Added init.py files with copyright headers and descriptive docstrings to all packages
• Created new test infrastructure with conftest.py and test_data.py fixtures
• Added comprehensive file upload example demonstrating both small and chunked uploads

Reviewed Changes

Copilot reviewed 28 out of 35 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/dataverse_sdk/core/*	New core infrastructure module with auth, config, errors, error_codes, and http client
src/dataverse_sdk/data/*	Separated OData client and file upload functionality
src/dataverse_sdk/utils/*	Utils module with pandas adapter and updated imports
src/dataverse_sdk/models/*	New models package (placeholder for future use)
src/dataverse_sdk/extensions/*	New extensions package (placeholder for future use)
src/dataverse_sdk/client.py	Updated imports to use new module structure
tests/*	Added init.py files and updated import paths in all test files
tests/conftest.py	New shared pytest fixtures for common test setup
tests/fixtures/test_data.py	New shared test data and mock responses
examples/*	Added init.py files, new file_upload.py example, and updated imports
examples/README.md	New comprehensive examples documentation

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