Add support for DeepseekAI's DeepseekVL

[geetu040]

What does this PR do?

Fixes #36110

This PR adds DeepseekAI's DeepseekVL model to Hugging Face Transformers.

DeepseekVL is an open-source Vision-Language (VL) Model designed for real-world vision and language understanding applications. DeepSeek-VL possesses general multimodal understanding capabilities, capable of processing logical diagrams, web pages, formula recognition, scientific literature, natural images, and embodied intelligence in complex scenarios.

Relevant Links

• Research Paper: DeepSeek-VL: Towards Real-World Vision-Language Understanding
• Authors: Haoyu Lu, Wen Liu, Bo Zhang, et al.
• Implementation: github.com/deepseek-ai/DeepSeek-VL
• Models Weights: huggingface.co/collections/deepseek-ai/deepseek-vl

CC: @Benjamin-eecs, @RERV (github contributors of deepseek-ai/DeepSeek-VL)

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• Did you write any new necessary tests?

Who can review?

@ArthurZucker, @Rocketknight1, @Cyrilvallez

TODOs

• Documentation
• Tests
• Import Statements and Auto Modeling
• Modeling
  • VisionModel
  • TextModel
  • AlignerModel
  • Support .generate() method
• Weight Conversion Script
• Tokenizer/Processor
• Fix CI/CD tests