mtmd: Add dynamic high-resolution image preprocessing for InternVL model (#20847)

* added support for internvl's dynamic high-resolution (Qianfan-OCR needed)

* add min/max dynamic patch to gguf meta

* clean up

* simplified handling min/max dynamic patch

* reuse llava_uhd logic for slice images

* provide default values for older models

* flake8

* prevent writing 0 value to gguf

* remove duplicated resolution candidates with a better algorithm

* fix indentation

* format

* add protection from divide by zero

* change to 0 to be safe

---------

Co-authored-by: Xuan Son Nguyen <son@huggingface.co>

tools/mtmd/clip-model.h

@@ -42,6 +42,9 @@ struct clip_hparams {
     int32_t image_max_pixels = -1;
     int32_t n_merge = 0; // number of patch merges **per-side**
 
+    int32_t preproc_min_tiles = 0;
+    int32_t preproc_max_tiles = 0;
+
     float image_mean[3];
     float image_std[3];