Add Gemini-Exp-1114 and Gemini-Exp-1121

[EwoutH]

gemini-exp-1114 and gemini-exp-1121 are Google's latest flagship model, topping the leaderboards at several places. It would be awesome to have MMLU-Pro scores on the leaderbord.

• gemini-exp-1114
• gemini-exp-1121

See: https://ai.google.dev/gemini-api/docs/models/experimental-models#gemini-api