refactor: Use Header auth in SmsClient

[SMadani]

Replaces usages of ApiKeyQueryParamsAuthMethod with ApiKeyHeaderAuthMethod where possible.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.99%. Comparing base (fe06b81) to head (24b3d00).
Report is 70 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #555      +/-   ##
============================================
+ Coverage     95.60%   95.99%   +0.39%     
- Complexity     3427     3752     +325     
============================================
  Files           513      564      +51     
  Lines          8141     8699     +558     
  Branches        451      496      +45     
============================================
+ Hits           7783     8351     +568     
+ Misses          198      175      -23     
- Partials        160      173      +13     

Files with missing lines	Coverage Δ
...rc/main/java/com/vonage/client/AbstractMethod.java	100.00% <100.00%> (+22.22%)	⬆️
...com/vonage/client/auth/ApiKeyHeaderAuthMethod.java	100.00% <ø> (ø)
.../java/com/vonage/client/insight/InsightClient.java	100.00% <100.00%> (ø)
src/main/java/com/vonage/client/sms/SmsClient.java	100.00% <100.00%> (ø)

... and 33 files with indirect coverage changes