Add option to ignore data annotation attributes

[rockfordlhotka]

There is some overhead to scanning business types during app startup in order to find and register the data annotation attributes as CSLA rules.

Normally this is incidental, but in a serverless scenario (for example) where app startup happens every time any code is used, this overhead can become problematic.

We can add an option to the AddCsla method to tell CSLA to not scan types for data annotation attributes. Normal rule registration would still occur, but without this scan, data annotation attributes would be ignored by CSLA.

[StefanOssendorf]

I can think of two ways:

• global setting to disable it for all objects
• add a flag to BusinessRules to make it a case per case setting. Important is to call base after changing the flag