Add WASI support for esp-idf platform: 1. add Kconfig and cmake scripts 2. add API "openat" when using littlefs 3. add clock/rwlock/file/socket OS adapter
This folder contains the platform abstract layer for multiple platforms. To support a new platform, you can simply create a new folder here and implement all the APIs defined in include folder.
Refer to port_wamr.md for how to port WAMR to a target platform.