Add sample pre-commit hook (#2470)

Using pre-commit hooks helps us to decrease CI load and improve developers' experience.

ci/pre_commit_hook_sample

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+#!/bin/bash
+
+# Copyright (C) 2023 Amazon.com Inc. or its affiliates. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+# This is a sample of pre-commit hook that can be used to make your code fit the WAMR CI code style requirements.
+# You need to have clang-format-12 installed to use this hook.
+# To add this pre-commit hook, copy it to <path_to_wamr>/.git/hooks/pre-commit
+# (you don't need any extensions here)
+
+# Function to check if a file has a C or C++ extension
+
+is_c_or_cpp_file() {
+    file="$1"
+    if [[ "$filename" =~ \.(h|c|cpp)$  ]]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+# Loop through staged files and apply command "abc" to C and C++ files
+for staged_file in $(git diff --cached --name-only); do
+    if is_c_or_cpp_file "$staged_file"; then
+        clang-format-12 -Werror --style file --dry-run "$staged_file" 2>/dev/null
+        if [ $? -ne 0 ]; then 
+            echo "Issues are found in $staged_file. Applying the fix" 
+            clang-format-12 --style file -i "$staged_file"
+        fi
+        git add "$staged_file"  # Add the modified file back to staging
+    fi
+done

ci/setup.sh

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+#!/bin/bash
+
+# Copyright (C) 2023 Amazon.com Inc. or its affiliates. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+# This script executes some commands to make your onboarding with WAMR easier.
+# For example, setting pre-commit hook that will make your code complaint with the
+# code style requirements checked in WAMR CI
+
+echo "Copy the pre-commit hook to your hooks folder"
+cp pre_commit_hook_sample ../.git/hooks/pre-commit
+
+# Feel free to propose your commands to this script to make developing WAMR easier
+
+echo "Setup is done"