Expose `rotary_base` as an arg instead of hardcoding

[sudhakarsingh27]

Description

Expose rotary_base as an arg instead of hardcoding to 10000

Fixes # (issue) https://github.com/NVIDIA/TransformerEngine/issues/849

Type of change

• [ ] Documentation change (change only to the documentation, either a fix or a new content)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Infra/Build change
• [x] Code refractor

[sudhakarsingh27]

/te-ci pytorch