add uvwasi implementation to support wasi on windows [experimental] (#534)

add uvwasi implementation to support wasi on windows [experimental] and update windows.yml

Co-authored-by: Wenyong Huang <wenyong.huang@intel.com>

core/iwasm/libraries/libc-uvwasi/libc_uvwasi.cmake

@@ -0,0 +1,30 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+set (LIBC_WASI_DIR ${CMAKE_CURRENT_LIST_DIR})
+set (UVWASI_DIR ${CMAKE_CURRENT_LIST_DIR}/../../../deps/uvwasi)
+set (LIBUV_VERSION v1.39.0)
+
+add_definitions (-DWASM_ENABLE_LIBC_WASI=1 -DWASM_ENABLE_UVWASI=1)
+
+include(FetchContent)
+## https://libuv.org
+FetchContent_Declare(
+    libuv
+    GIT_REPOSITORY https://github.com/libuv/libuv.git
+    GIT_TAG ${LIBUV_VERSION})
+
+FetchContent_GetProperties(libuv)
+if(NOT libuv_POPULATED)
+    message ("-- Fetching libuv ..")
+    FetchContent_Populate(libuv)
+    include_directories("${libuv_SOURCE_DIR}/include")
+    add_subdirectory(${libuv_SOURCE_DIR} ${libuv_BINARY_DIR} EXCLUDE_FROM_ALL)
+    set (UV_A_LIBS uv_a)
+endif()
+
+include_directories(${UVWASI_DIR}/include)
+
+file (GLOB_RECURSE source_all ${LIBC_WASI_DIR}/*.c ${UVWASI_DIR}/src/*.c)
+
+set (LIBC_WASI_SOURCE ${source_all})