Implement Azure Data Lake Storage (ADLS) cloud connections

[Edwardvaneechoud]

This commit adds comprehensive support for ADLS Gen2 storage with multiple
authentication methods, full read/write capabilities, and local testing support
via Azurite emulator.

Backend changes:

• Add azure_sas_token field to cloud storage schemas and database models
• Implement ADLS storage options for access_key, service_principal, and sas_token auth
• Add ADLS path parsing utilities (az:// and abfs:// URI formats)
• Add Azure Blob Storage client integration with file listing capabilities
• Update cloud storage reader to support ADLS paths alongside S3
• Store and retrieve ADLS secrets (account_key, client_secret, sas_token)

Worker changes:

• Add ADLS storage options to worker models with secret decryption
• Enable ADLS write operations for all file formats (Parquet, CSV, JSON, Delta)
• Support all ADLS authentication methods in worker context

Frontend changes:

• Enable ADLS storage type option in cloud connection UI
• Add UI fields for Azure-specific credentials (account name, keys, tenant, etc.)
• Add SAS token authentication support with password field visibility toggle
• Add azure_sas_token to TypeScript type definitions and API conversions
• Update form validation for ADLS connection requirements

Dependencies:

• Add azure-storage-blob ^12.24.0 for Blob Storage SDK
• Add azure-identity ^1.19.0 for service principal authentication
• Add adlfs ^2025.1.0 for Polars integration

Testing infrastructure:

• Create test_utils/adls module for Azurite-based testing
• Add start_azurite and stop_azurite CLI commands
• Implement test data generator with Parquet, CSV, and JSON samples
• Add comprehensive README with usage examples and troubleshooting
• Create managed_azurite context manager for integration tests

Supported features:

• Multiple authentication methods: access key, service principal, SAS token
• Read operations: single files and directory wildcards
• Write operations: Parquet, CSV, JSON, Delta Lake formats
• Path formats: both az:// and abfs:// URI schemes
• Local testing with Azurite emulator (Docker-based)
• Secure secret storage with per-user encryption

Files modified: 9 backend/frontend files
Files created: 5 test utility files

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