Fuse bias with geglu in ParallelMLP
# What does this PR do ?

Fuse bias with geglu in ParallelMLP

# Changelog 
fused bias with geglu using TorchScript, fused function is in the newly added file fused_bias_geglu.py
in ParallelMLP, changed bias_gelu_fusion to biad_activation_fusion for generality, also fixed the way of this arg is propagated

# Usage
By default, bias_activation_fusion=True. If you want to disable it, simply set it as False in your config file.

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**PR Type**:
- [x] New Feature
- [ ] Bugfix
- [ ] Documentation

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# Additional Information
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