babelfish-for-postgresql / babelfish_extensions / 11071513733

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Fix protocol violation in USE DB when database name contains multibyte characters (#2982)

When database name contains a character which is multi byte encoded in UTF8 then USE DB with that database name throws protocol error in SQLCMD.
```
-- SQL CMD connection
1> CREATE DATABASE ["龙漫远; 龍漫😃😄漫遠.¢£€¥"]
2> go
1> USE ["龙漫远; 龍漫😃😄漫遠.¢£€¥"]
2> go
SqlState HY000, Protocol error in TDS stream.
```
This does not show up in our JDBC framework since we ignore such notice message and do not flush it to output file.

Length of string in TDS stream should be in UTF-16 characters length and not number of bytes.
Hence replaced strlen() with UTF16 number of chars.


Task: BABEL-5153

Signed-off-by: Tanzeel Khan <tzlkhan@amazon.com>

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