DEVX-7324: Add Number Insight v2

[superchilled]

This PR adds Number Insight v2 functionality to the SDK. Specifically it:

• Defines a NumberInsight2 class with 1 method:
  • fraud_check. This method initiates a fraud check for a specific number via the /vs/ni endpoint
• Defines a number_insight_2 method in the Client class which returns a NumberInsight2 object
• Adds unit tests to cover the above changes

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (88a87c6) 97.95% compared to head (b472fc0) 97.97%.

:exclamation: Current head b472fc0 differs from pull request most recent head e9292b2. Consider uploading reports for the commit e9292b2 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #299 +/- ## ========================================== + Coverage 97.95% 97.97% +0.01% ========================================== Files 108 109 +1 Lines 2008 2020 +12 ========================================== + Hits 1967 1979 +12 Misses 41 41 ```

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