Add support for specifying NCCL version with nccl_version flag

[ezhulenev]

Add support for specifying NCCL version with nccl_version flag

[gemini-code-assist]

Summary of Changes

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This pull request enhances the build script by adding support for specifying a hermetic NCCL version. This change provides greater control and flexibility for users who need to build with a particular NCCL version, ensuring consistency and reproducibility in their build environments.

Highlights

• New Command-Line Argument: Introduced a new command-line argument, --nccl_version, to allow users to explicitly specify the hermetic NCCL version to be used during the build process.
• Environment Variable Configuration: The provided --nccl_version is now used to set the HERMETIC_NCCL_VERSION environment variable, ensuring that the specified NCCL version is applied to the wheel build commands.

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[gemini-code-assist]

Code Review

This pull request adds support for specifying the NCCL version using a new --nccl_version flag. The implementation is consistent with how similar flags, like --cudnn_version, are handled. My review includes a couple of minor stylistic suggestions to remove trailing whitespace, adhering to PEP 8 guidelines.