Add support to release linux aarch64 wheels

[odidev]

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Problem

On aarch64, pip install vispy builds the wheels from source code and then installs it. It requires the user to have a development environment installed on their system. Also, it takes more time to build the wheels than downloading and extracting the wheels from PyPI.

Resolution

On aarch64, pip install vispy should download the wheels from PyPI.

@djhoese, Please let me know your interest in releasing aarch64 wheels. I can help with this.