feat: Exceptions now supply ways to get the raw request and response

[dragonmantank]

To help with debugging, exceptions based on VonageApiResponseException now offer two methods to help with debugging:

• getRawRequest() - Get the request that was generated and sent to the Vonage API
• getRawResponse() - Get the full response that was returned by the Vonage API

This makes it easier to help debug when the server throws an error, especially with structural errors with JSON.

Contribution Checklist

• Unit tests!
• Updated CHANGELOG.md
• My name is in CONTRIBUTORS.md

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.94%. Comparing base (263fb2b) to head (ae7f7e6).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #614   +/-   ##
=========================================
  Coverage     98.93%   98.94%           
- Complexity     3623     3628    +5     
=========================================
  Files           545      545           
  Lines          8008     8019   +11     
  Branches        443      444    +1     
=========================================
+ Hits           7923     7934   +11     
  Misses           64       64           
  Partials         21       21           

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