Add `Kosmos-2` model (#24709)

* Add KOSMOS-2 model

* update

* update

* update

* address review comment - 001

* address review comment - 002

* address review comment - 003

* style

* Apply suggestions from code review

Co-authored-by: amyeroberts <[email protected]>

* fix

* address review comment - 004

* address review comment - 005

* address review comment - 006

* address review comment - 007

* address review comment - 008

* address review comment - 009

* address review comment - 010

* address review comment - 011

* update readme

* fix

* fix

* fix

* [skip ci] fix

* revert the change in _decode

* fix docstring

* fix docstring

* Update docs/source/en/model_doc/kosmos-2.md

Co-authored-by: NielsRogge <[email protected]>

* no more Kosmos2Tokenizer

* style

* remove "returned when being computed by the model"

* Apply suggestions from code review

Co-authored-by: Arthur <[email protected]>

* UTM5 Atten

* fix attn mask

* use present_key_value_states instead of next_decoder_cache

* style

* conversion scripts

* conversion scripts

* conversion scripts

* Add _reorder_cache

* fix doctest and copies

* rename 1

* rename 2

* rename 3

* make fixup

* fix table

* fix docstring

* rename 4

* change repo_id

* remove tip

* update md file

* make style

* update md file

* put docs/source/en/model_doc/kosmos-2.md to slow

* update conversion script

* Use CLIPImageProcessor in Kosmos2Processor

* Remove Kosmos2ImageProcessor

* Remove to_dict in Kosmos2Config

* Remove files

* fix import

* Update conversion

* normalized=False

* Not using hardcoded values like <image>

* elt --> element

* Apply suggestion

* Not using hardcoded values like </image>

* No assert

* No nested functions

* Fix md file

* copy

* update doc

* fix docstring

* fix name

* Remove _add_remove_spaces_around_tag_tokens

* Remove dummy docstring of _preprocess_single_example

* Use `BatchEncoding`

* temp

* temp

* temp

* Update

* Update

* Make Kosmos2ProcessorTest a bit pretty

* Update gradient checkpointing

* Fix gradient checkpointing test

* Remove one liner remove_special_fields

* Simplify conversion script

* fix add_eos_token

* update readme

* update tests

* Change to microsoft/kosmos-2-patch14-224

* style

* Fix doc

---------

Co-authored-by: ydshieh <[email protected]>
Co-authored-by: amyeroberts <[email protected]>
Co-authored-by: NielsRogge <[email protected]>
Co-authored-by: Arthur <[email protected]>