[Model] add kosmos2

• tested on MME dataset

observation: It seems that Kosmos2 does not pre-train well with strong knowledge, resulting in poor performance on datasets that require extensive knowledge (testes with MMBench, overall only get 0.013), but it performance is as expected while testing on other dataset which do not require as much knowledge:

• BLINK dataset

• LLavaBench

• MMMU

• MMStar

• MMVet