Enable Microsoft SQL Server Dialect to work with primary key default.

Currently the SqlServerDialect requires use of IDENTITY to retrieve inserted id values.

ID INT IDENTITY PRIMARY KEY

The above can be tricky when attempting to e.g. upsert values (see: #493) as it requires additional statements SET IDENTITY_INSERT <table_name> ON|OFF to allow inserting values into the ID column.

Using a different column declaration approach neglects the need of the additional identity insert instructions.

ID INT PRIMARY KEY DEFAULT (NEXT VALUE FOR <seqence_name>)

Unfortunately using key defaults does not return the obtained value unless explicitly advised using OUTPUT INSERTED.<column_name>.

The SqlServerDialect should allow users to choose their identity strategy based on which OUTPUT INSERTED is included in the statement or not.

Running additional commands to en/disable IDENTITY_INSERT before/after the statement is in the users responsibility when choosing IDENTITY. They should not be run by data-jdbc as part of an insert/upsert attempt.