Add support for MSSQL Always Encrypted

[jarpz]

Reviewing StackOverflow there is no major information about support.

https://stackoverflow.com/questions/65512096/always-encrypted-with-r2dbc

Any plan to support the Always Encrypted feature as JDBC does?

https://docs.microsoft.com/en-us/sql/connect/jdbc/using-always-encrypted-with-the-jdbc-driver?view=sql-server-ver15

Regards

[mp911de]

We would be happy to accept a pull request that introduces support for Always Encrypted.