Backend.ai

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FIX
- Fix interactive user inputs in the batch-mode execution.

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NEW
- Add support for the batch-mode API with compiled languages such as
C/C++/Java/Rust.
- Add support for the file upload API for use with the batch-mode API.
(up to 20 files per request and 1 MiB per each file)

CHANGES
- Only files stored in "/home/work.output" directories of kernel containers
are auto-uploaded to S3 as downloadable files, as now we rely on our
dedicated multi-media output interfaces to show plots and other graphics.
Previously, all non-hidden files in "/home/work" were uploaded.

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- Fix a regression in console output streaming.

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- Add PyTorch support.
- Upgrade aiohttp to v2 and relevant dependencies as well.

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- Update missing long_description.

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- Improve packaging: auto-converted README.md as long description and unified
requirements.txt and setup.py dependencies.