Add WASI support for esp-idf platform (#3348)

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

build-scripts/esp-idf/wamr/Kconfig

@@ -0,0 +1,77 @@
+menu "WASM Micro Runtime"
+    choice WAMR_BUILD_TYPE
+        prompt "Build type"
+        default WAMR_BUILD_RELEASE
+
+        config WAMR_BUILD_RELEASE
+            bool "Release"
+
+        config WAMR_BUILD_DEBUG
+            bool "Debug"
+    endchoice
+
+    config WAMR_ENABLE_AOT
+        bool "AOT"
+        default y
+
+    menuconfig WAMR_ENABLE_INTERP
+        bool "Interpreter"
+        default y
+
+    if WAMR_ENABLE_INTERP
+
+       choice WAMR_INTERP_MODE
+            prompt "Interpreter mode"
+            default WAMR_INTERP_FAST
+
+            config WAMR_INTERP_CLASSIC
+                bool "Classic"
+
+            config WAMR_INTERP_FAST
+                bool "Fast"
+        endchoice
+
+        choice WAMR_INTERP_LOADER_MODE
+            prompt "Loader mode"
+            default WAMR_INTERP_LOADER_NORMAL
+
+            config WAMR_INTERP_LOADER_NORMAL
+                bool "Normal"
+
+            config WAMR_INTERP_LOADER_MINI
+                bool "Mini"
+        endchoice
+    endif
+
+    config WAMR_ENABLE_LIB_PTHREAD
+        bool "Lib pthread"
+        default y
+
+    config WAMR_ENABLE_LIBC_BUILTIN
+        bool "Libc builtin"
+        default y
+
+    config WAMR_ENABLE_LIBC_WASI
+        bool "Libc WASI"
+        default y
+
+    config WAMR_ENABLE_MEMORY_PROFILING
+        bool "Memory profiling"
+        default n
+
+    config WAMR_ENABLE_MULTI_MODULE
+        bool "Multi module"
+        default n
+
+    config WAMR_ENABLE_PERF_PROFILING
+        bool "Performance profiling"
+        default n
+
+    config WAMR_ENABLE_REF_TYPES
+        bool "Reference types"
+        default n
+
+    config WAMR_ENABLE_SHARED_MEMORY
+        bool "Shared memory"
+        default n
+endmenu