Add azure blob storage support

[JohnJyong]

Description

Add azure blod storage support:
If you want to use Azure Bolb Storage as your file storage, pls set below env.

1. Start Dify by docker-compose, pls set below variable with your configration in docker-compose.yaml , both api and worker service.

      STORAGE_TYPE: 'azure-blob'
      AZURE_BLOB_ACCOUNT_NAME: 'difyai'
      AZURE_BLOB_ACCOUNT_KEY: 'difyai'
      AZURE_BLOB_CONTAINER_NAME: 'difyai-container'
      AZURE_BLOB_ACCOUNT_URL: 'https://<your_account_name>.blob.core.windows.net'

2. Start Dify by local code , pls setup your .env file , set below variable with your configration

STORAGE_TYPE=azure-blob
# Azure Blob Storage configuration
AZURE_BLOB_ACCOUNT_NAME=your-account-name
AZURE_BLOB_ACCOUNT_KEY=your-account-key
AZURE_BLOB_CONTAINER_NAME=yout-container-name
AZURE_BLOB_ACCOUNT_URL=https://<your_account_name>.blob.core.windows.net

Type of Change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update, included: Dify Document
• Improvement，including but not limited to code refactoring, performance optimization, and UI/UX improvement
• Dependency upgrade

Suggested Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods
• optional I have made corresponding changes to the documentation
• optional I have added tests that prove my fix is effective or that my feature works
• optional New and existing unit tests pass locally with my changes

[takatost]

LGTM

[crazywoola]

@JohnJyong langgenius/dify-docs#45