llama : Add IBM granite template (#10013)

* Add granite template to llama.cpp

* Add granite template to test-chat-template.cpp

* Update src/llama.cpp

Co-authored-by: Xuan Son Nguyen <thichthat@gmail.com>

* Update tests/test-chat-template.cpp

Co-authored-by: Xuan Son Nguyen <thichthat@gmail.com>

* Added proper template and expected output

* Small change to \n

Small change to \n

* Add code space &

Co-authored-by: Xuan Son Nguyen <thichthat@gmail.com>

* Fix spacing

* Apply suggestions from code review

* Update src/llama.cpp

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Co-authored-by: Xuan Son Nguyen <thichthat@gmail.com>