Support client-side variable substitution in queries as a fallback

[mjoerussell]

I was doing some testing with a Snowflake database and discovered that Snowflake does not support query parameters like, for example, Postgres. An example of using query parameters in zdb would be:

var prepared_statement = try connection.prepareStatement("SELECT * from my_table where id > ?");
try prepared_statement.addParam(1, 10);

zdb should support some level of query parameters even with drivers that do not support driver-side parameters. This could be done with simple serialization and substitution, however we should also make some calls to SQLColumns to ensure that the value's type matches the column.

This system should only be used as a fallback - we want to use the driver's parameter system whenever possible. This should probably also be handled automatically. The programmer shouldn't have to make any code changes if they switch to a new database that implements this differently.