Adding --num_workers input parameter to the EEG_GCNN example.

[drivanov]

Description

The previously used hardcoded value NUM_WORKERS=4 has been replaced by the --num_workers input parameters with a default value of 4.

Checklist

Please feel free to remove inapplicable items for your PR.

• I've leverage the tools to beautify the python and c++ code.
• The PR is complete and small, read the Google eng practice (CL equals to PR) to understand more about small PR. In DGL, we consider PRs with less than 200 lines of core code change are small (example, test and documentation could be exempted).
• All changes have test coverage
• Code is well-documented
• To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Changes

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