CompileBuildOptions.aotExplain

With aot: reports to add to BuildOutput.logs, at level "verbose".

• "text": the code that compiled to a slow path, one entry per cause with a fix, worst first
• "json": the same, one JSON object per line
• "guards": every type guard that can fail at run time, why the compiler couldn't remove it, and how to fix it
• "guards-json": the same, one JSON object per line
• "trim": which Bun and Node.js APIs the program uses, and why trim kept or removed each feature
• "missed-optimizations": calls that weren't inlined, loops that weren't optimized, and why
• "allocations": where each object is allocated (stack, heap or removed), and why

Equivalent CLI flag: --explain