Add charset converter to convert non utf-8 char

[anisurrahman75]

Database name

MS SQL-Server

Pull request description

Linux OS:

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=22.04
DISTRIB_DESCRIPTION="Ubuntu 22.04.4 LTS"
VERSION="22.04.4 LTS (Jammy Jellyfish)"

SQL Server Version: 2022-CU12-ubuntu-22.04

Error:

> ERROR: 2024/05/10 16:11:34.598412 proxy: failed to read blocklist xml: EOF

During the backup process, SQL Server always provides data encoded in UTF-8(Tested for Linux: 2022-CU12-ubuntu-22.04 and Windows: SQL Server 2022).
However, inside the wal-g codebase, we always assume that the data is encoded in UTF-16. As a result, during the decoding process, we encounter an EOF error.
So, I added a decoder which convert any non UTF-16 character to UTF-8.

Please provide steps to reproduce (if it's a bug)

Just try to back up SQL-Server Latest by using Wal-g

Please add config and wal-g stdout/stderr logs for debug purpose

2024/05/10 16:11:34 WARN: You specified both instance name and port in the connection string, port will be used and instance name will be ignored
INFO: 2024/05/10 16:11:34.190430 running proxy at backup.local:443
INFO: 2024/05/10 16:11:34.436030 database [demo] size is 6478336, required blob count 1
INFO: 2024/05/10 16:11:34.436046 starting backup database [demo] to URL = 'https://backup.local/basebackups_005/base_20240510T101134Z/demo/blob_000'
ERROR: 2024/05/10 16:11:34.598412 proxy: failed to read blocklist xml: EOF
ERROR: 2024/05/10 16:11:34.598761 proxy: failed to read blocklist xml: EOF
ERROR: 2024/05/10 16:11:34.599061 proxy: failed to read blocklist xml: EOF
ERROR: 2024/05/10 16:11:34.599358 proxy: failed to read blocklist xml: EOF
ERROR: 2024/05/10 16:11:36.497753 proxy: failed to read blocklist xml: EOF
ERROR: 2024/05/10 16:11:38.498794 proxy: failed to read blocklist xml: EOF
^X^CINFO: 2024/05/10 16:11:40.777150 Received interrupt signal. Shutting down
INFO: 2024/05/10 16:11:40.777175 stopping proxy
^C^Zfish: Job 1, 'sudo wal-g backup-push --config…' has stopped

[mialinx]

LGTM