add error name to error deser

[AllanZhengYP]

Now SDK throws error like:

{Error: 1 validation error detected: Value null at 'certificateArn' failed to satisfy constraint: Member must not be null 
...

After the change, the thrown error looks like:

{ValidationException: 1 validation error detected: Value null at 'certificateArn' failed to satisfy constraint: Member must not be null 
...

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[mtdowling]

Cool! Curious though -- how does adding "name" make this display better error messages?

[AllanZhengYP]

@mtdowling name it's like error's "class" which doesn't exist in JavaScript. By default the error name is Error with different error message. Changing name makes it shows the error code from service side, like ValidationException or SignatureMismatchException

[trivikr]

@mtdowling Merge?

[trivikr]

MDN on Error.prototype.name https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/name