## What changes were proposed in this pull request?
This PR proposes to add cmd scripts so that Windows users can also run `spark-sql` script.
## How was this patch tested?
Manually tested on Windows.
**Before**
```cmd
C:\...\spark>.\bin\spark-sql
'.\bin\spark-sql' is not recognized as an internal or external command,
operable program or batch file.
C:\...\spark>.\bin\spark-sql.cmd
'.\bin\spark-sql.cmd' is not recognized as an internal or external command,
operable program or batch file.
```
**After**
```cmd
C:\...\spark>.\bin\spark-sql
...
spark-sql> SELECT 'Hello World !!';
...
Hello World !!
```
Author: hyukjinkwon <gurwls223@gmail.com>
Closes#19808 from HyukjinKwon/spark-sql-cmd.
