Backend-ai-client

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**FIXES**

- Include missing dependencies: multidict

- Improve Windows platform supports (12)

**CHANGES**

- Install asyncio-based dependencies by default (aiohttp and async_timeout)

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**CHANGES**

- Rename the product name "Sorna" to "Backend.AI".
- Package import path: "sorna" → "ai.backend.client"
- Class names: "SornaError" / "SornaAPIError" → "BackendError" / "BackendAPIError"
- Any mention of "Sorna" in the API headers → "BackendAI".
e.g., "X-Sorna-Version" API request header → "X-BackendAI-Version"

- Refactor the internal structure for sync/async API functions.

- Add support for the Admin API based on GraphQL both in the CLI and the functions.
Now you can list up details of your compute sessions with ease.

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**FIX**

- Missing sorna.cli module in distribution.

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**NEW**

- Add console scripts "lcc" and "lpython" which are aliases
of "python -m sorna.cli run c" and "python -m sorna.cli run python".

- Add explicit "--build" and "--exec" option for batch-mode
customization.

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**FIX**

- Fix support for interactive inputs in the batch mode.

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**CHANGES**

- The `run` command now prints the build status in the batch mode.