Add sqlsrv and pdo_sqlsrv extensions

[stevdompl]

Thank you for your tap!

Describe the feature
Could you please add the sqlsrv and pdo_sqlsrv extensions?

Additional context
https://github.com/microsoft/msphpsql
https://docs.microsoft.com/pl-pl/sql/connect/php/microsoft-php-driver-for-sql-server
https://docs.microsoft.com/pl-pl/sql/connect/odbc/microsoft-odbc-driver-for-sql-server

[shivammathur]

Added