fix: array filter/map/forEach support index as second callback param

[cs01]

Summary

• Array filter, map, and forEach now correctly pass the loop index as the second callback parameter when the callback declares two parameters (e.g., (val, idx) => ...)
• Fixes native compiler crash ("array index out of bounds") when callbacks use the index parameter, by providing proper type hints via setExpectedCallbackParamTypes for both params
• Works for both numeric and string arrays

Test plan

• New test fixture arrays/callback-index-param.ts covers filter+index, map+index for both number[] and string[]
• npm run verify:quick passes (all tests + Stage 1 self-hosting)

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