Integrate WASI-NN into WAMR (#1521)

Initial integration of WASI-NN based on #1225:
- Implement the library core/iwasm/libraries/wasi-nn
- Support TensorFlow, CPU, F32 at the first stage
- Add cmake variable `-DWAMR_BUILD_WASI_NN`
- Add test case based on Docker image and update document

Refer to #1573

core/iwasm/libraries/wasi-nn/test/Dockerfile

@@ -0,0 +1,32 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+FROM ubuntu:22.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install -y \
+    cmake build-essential git wget python3.10 python3-pip
+
+RUN wget -q https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-14/wasi-sdk-14.0-linux.tar.gz && \
+    tar xf wasi-sdk-*-linux.tar.gz -C /opt && rm -f wasi-sdk-*-linux.tar.gz && \
+    mv /opt/wasi-sdk-14.0 /opt/wasi-sdk
+
+WORKDIR /home/wamr
+
+COPY core core
+COPY build-scripts build-scripts
+COPY product-mini product-mini
+
+RUN pip3 install -r core/iwasm/libraries/wasi-nn/test/requirements.txt
+
+WORKDIR /home/wamr/core/iwasm/libraries/wasi-nn/test/build
+
+RUN cmake -DWAMR_BUILD_WASI_NN=1 ..
+RUN make -j $(grep -c ^processor /proc/cpuinfo)
+
+WORKDIR /home/wamr/core/iwasm/libraries/wasi-nn/test
+
+RUN ./build.sh
+
+ENTRYPOINT [ "./build/iwasm",  "--dir=.", "test_tensorflow.wasm" ]