Add support for optional address search fields in place of smartykey to the us-address-enrichment-api

[RyanLCox1]

Name	Type	Default value	Description
Optional Address Search Fields			IMPORTANT: When using any search field, you must specify the word search in place of the SmartyKey in the URL. See examples.
freeform	string	(empty)	A full address.
street	string	(empty)	The street line of the address, or the entire address. You may also need to provide values for other component search fields.
city	string	(empty)	The city name or a city, state, and ZIP Code combined. You may also need to provide values for other component search fields.
state	string	(empty)	The state name or abbreviation. You may also need to provide values for other component search fields.
zipcode	string	(empty)	The ZIP Code. You may also need to provide values for other component search fields.