add PAT-LLM MindSpore implementation

[ceiling77]

What does this PR do?

Adds the MindSpore and MindNLP implementation of PAT-LLM under research/nlp/pat_llm and registers it in the research model catalog.

The implementation includes Multi-Patch Attention, Attention-as-Prompt, LLM reprogramming, chronological CSV data loading, YAML configuration, standalone Ascend scripts, evaluation, and bilingual documentation.

Validation

• Python source parsed successfully with AST checks.
• Pylint passed with unavailable-runtime import checks disabled.
• All Python source lines are at most 100 characters.
• Runtime training and evaluation require a supported MindSpore/MindNLP environment and the industrial dataset.

[CLAassistant]

All committers have signed the CLA.