Add support for aten._fused_rms_norm operator

[SandSnip3r]

Description

This PR adds support for the torch.ops.aten._fused_rms_norm.default operator in Torch-TensorRT's dynamo conversion path. RMS (Root Mean Square) Normalization is a normalization technique used in modern transformer architectures and diffusion models.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[meta-cla]

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