DEVX-7520: Adding Users

[superchilled]

This PR implements Users functionality into the SDK. Specifically it:

• Updated the Client class to add a users method which returns a Users object.
• Defines a Users class with the following methods:
• • list
• • find
• • create
• • update
• • delete
• Adds unit tests to cover the added functionality.

[codecov-commenter]

Codecov Report

Merging #282 (dd92161) into main (c9097d2) will increase coverage by 0.02%. The diff coverage is 100.00%.

:exclamation: Current head dd92161 differs from pull request most recent head 213bf03. Consider uploading reports for the commit 213bf03 to get more accurate results

@@            Coverage Diff             @@
##             main     #282      +/-   ##
==========================================
+ Coverage   97.94%   97.96%   +0.02%     
==========================================
  Files         105      107       +2     
  Lines        1944     1967      +23     
==========================================
+ Hits         1904     1927      +23     
  Misses         40       40              

Files Changed	Coverage Δ
lib/vonage/verify2.rb	100.00% <ø> (ø)
lib/vonage/client.rb	100.00% <100.00%> (ø)
lib/vonage/users.rb	100.00% <100.00%> (ø)
lib/vonage/users/list_response.rb	100.00% <100.00%> (ø)

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