pack: Check whether inside of coroutine or not

[cosmo0920]

This is another attempt of #11586.
When compiling with SIMD and using YYJSON which is stack based high performance JSON library, it causes SEGV on processing large size of JSON.
Plus, inside of coroutines, we often experienced SEGV which is caused by stack overflow that is ran out of the allocated size of coroutine.
So, we should detect the JSON component could be running on whether coroutine or not.

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