* track if WASIArguments is configured by user
i plan to use this to decide which wasi arguments
(the one from module or the one from InstantiationArgs2)
to use.
* add WASIArguments to InstantiationArgs2
* use wasi configuration from InstantiationArgs2 if any
fallback to the via-module configuration for now.
* add a few api to configure wasi via InstantiationArgs2
* configure wasi via InstantiationArgs2 for platforms using libc_wasi.c
* rt-thread: migrate to libc_wasi_set_init_args
* common/libc_wasi.c: retire libc_wasi_init
* fix build without wasi