[None][perf] Fold q/k/v quantization into qknorm_rope_fused kernel & remove contiguous

[brb-nv]

Description

This MR does the following:

• Folds q/k/v quantization into fused qk norm + rope kernel.
• Removes .contiguous() calls on main q/k as well as index q/k.

Test Coverage

$ pytest tests/integration/defs/accuracy/test_llm_api_pytorch.py::TestMiniMaxM3::test_nvfp4[use_msa=True] -s -v

PR Checklist

Please review the following before submitting your PR:

• PR description clearly explains what and why. If using CodeRabbit's summary, please make sure it makes sense.

• PR Follows TRT-LLM CODING GUIDELINES to the best of your knowledge.

• Test cases are provided for new code paths (see test instructions)

• If PR introduces API changes, an appropriate PR label is added - either api-compatible or api-breaking. For api-breaking, include BREAKING in the PR title.

• Any new dependencies have been scanned for license and vulnerabilities

• CODEOWNERS updated if ownership changes

• Documentation updated as needed

• Update tava architecture diagram if there is a significant design change in PR.

• The reviewers assigned automatically/manually are appropriate for the PR.

• Please check this after reviewing the above items as appropriate for this PR.

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