add to inspect (#1065)
* adding lcb to inspect-ai
* adding lcb
* adds aime
* add ifeval french
* move prompts to respective eval file
* rename mmlu prompt functoin
* move prompt function to task files
* move prompt function to task files
* prompt function names end with _prompt
* fix missing
* prompt function names end with _prompt
* remove LETTER_INDEX
* fix tests
* revert lcb
* add to inspect
* add mixeval and musr
* Apply suggestion from @NathanHB
* Apply style fixes
* adding tasks to inspect
* adding tasks to inspect
* adds tasks that are defined in inspect
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