Move data manipulation methods out to a service

[denniswritescode]

https://github.com/dennisporterjr/ql-contacts/blob/c87c5c119a6b8053a0c8c4ad8be89e653b6c6380/src/app/view/contacts/contact-form/contact-form.component.ts#L44-L50

To allow the contact form to be less concerned with logging things and prepping data, move the serialize() and prepare() methods out to a ContactDataService service. The new service can be focused on manipulating contact data.