2.0.0-ALPHA.1 ConfigQueryRequestHandler.readFileContent miss line char. 读配置丢失换行符

[CherishCai]

Describe the bug
ConfigQueryRequestHandler.readFileContent miss line char.
读配置丢失换行符

Expected behavior
Restore the original configuration content.
还原为原本的配置，直接 read 字节后转成字符串为最佳？

Acutally behavior
The newline character is lost, and the configuration content is inconsistent with the server after it is returned to the client MD5.
丢失换行符，配置内容返回客户端 md5 后与服务端不一致。

Additional context
That's what I'm dealing with right now.
暂时如此处理，但内容该是返璞归真。

config/src/main/java/com/alibaba/nacos/config/server/remote/ConfigQueryRequestHandler.java

public static String readFileContent(File file) {

        StringBuilder sb = new StringBuilder();
        try (BufferedReader reader = new BufferedReader(new FileReader(file))) {

            String tempStr;
            while ((tempStr = reader.readLine()) != null) {
                // FIXME readLine lose '\n', It may not be restored because the content is inconsistent. The MD5 value of the client is different from that of the server
                sb.append(tempStr).append('\n');
            }
            sb.setLength(sb.length() - 1);

            return sb.toString();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return sb.toString();
    }

[CherishCai]

org.apache.commons.io.FileUtils.readFileToString(file);

[shiyiyue1102]

Describe the bug
ConfigQueryRequestHandler.readFileContent miss line char.
读配置丢失换行符

Expected behavior
Restore the original configuration content.
还原为原本的配置，直接 read 字节后转成字符串为最佳？

Acutally behavior
The newline character is lost, and the configuration content is inconsistent with the server after it is returned to the client MD5.
丢失换行符，配置内容返回客户端 md5 后与服务端不一致。

Additional context
That's what I'm dealing with right now.
暂时如此处理，但内容该是返璞归真。

config/src/main/java/com/alibaba/nacos/config/server/remote/ConfigQueryRequestHandler.java

public static String readFileContent(File file) {

        StringBuilder sb = new StringBuilder();
        try (BufferedReader reader = new BufferedReader(new FileReader(file))) {

            String tempStr;
            while ((tempStr = reader.readLine()) != null) {
                // FIXME readLine lose '\n', It may not be restored because the content is inconsistent. The MD5 value of the client is different from that of the server
                sb.append(tempStr).append('\n');
            }
            sb.setLength(sb.length() - 1);

            return sb.toString();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return sb.toString();
    }

OK，I have reproduce this bug local ,thank you very much to report this bug.

[CherishCai]