SqlBatchCommand support CommandBehavior

[campersau]

Description

#1825 added the Batch APIs and also added a CommandBehavior property to SqlBatchCommand which was completly unused.
Note: SqlBatchCommand.CommandBehavior is a custom property in SqlClient which isn't in the DbBatchCommand

Also the CommandBehavior for ExecuteReader was ignored.

This PR enables the use of the SqlBatchCommand.CommandBehavior and also supports passing CommandBehavior to ExecuteReader.

Issues

Fixes #4083

Testing

Added tests for passing CommandBehavior.SchemaOnly | CommandBehavior.KeyInfo to SqlBatchCommand.CommandBehavior.
Added tests for passing CommandBehavior.CloseConnection to ExecuteReader.

[campersau]

Copied from

SqlClient/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/SqlCommandSet.cs

Lines 275 to 282 in a11341f

	internal void ValidateCommandBehavior(string method, CommandBehavior behavior)
	{
	if (0 != (behavior & ~(CommandBehavior.SequentialAccess | CommandBehavior.CloseConnection)))
	{
	ADP.ValidateCommandBehavior(behavior);
	throw ADP.NotSupportedCommandBehavior(behavior & ~(CommandBehavior.SequentialAccess | CommandBehavior.CloseConnection), method);
	}
	}