Added endpoint to Paystack core for fetching address states

[zaheer-dvt]

Changes:

• Created models for the Address States responses
• Created AddressVerificationService which builds the request and returns a Service to fetch the address states
• Added an extension to the Paystack object that makes use of the above
• Added a json file for testing and unit tests to test the endpoint

[github-actions[bot]]

	Warnings
:warning:	The source files were changed, but the tests remain unmodified. Consider updating or adding to the tests to match the source changes.

Generated by :no_entry_sign: Danger Swift against 50b5ec745f655378e88fe226ec0f02c4abde3ad7

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

No Coverage information
0.0% Duplication