Add new model LFM2-VL (#40624)
* Add LFM2-VL support
* add tests
* linting, formatting, misc review changes
* add siglip2 to auto config and instantiate it in lfm2-vl configuration
* decouple image processor from processor
* remove torch import from configuration
* replace | with Optional
* remove layer truncation from modeling file
* fix copies
* update everything
* fix test case to use tiny model
* update the test cases
* fix finally the image processor and add slow tests
* fixup
* typo in docs
* fix tests
* the doc name uses underscore
* address comments from Yoni
* delete tests and unsuffling
* relative import
* do we really handle imports better now?
* fix test
* slow tests
* found a bug in ordering + slow tests
* fix copies
* dont run compile test
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Co-authored-by: Anna <anna@liquid.ai>
Co-authored-by: Anna Banaszak <48625325+ankke@users.noreply.github.com>
