Add skypeForConsumer as conferencing provider.

[SubashPradhan]

• Free Outlook accounts supports creating skype as conferencing while creating events.
• Currently this is not listed as supported conferencing provider in JAVA sdk.
• When user fetches event and an event has skype as conferencing, the request fails due to unsupported conferencing.
• Add skypeForConsumer as supported conferencing provider.
• Reproduced the error locally and tested the fix locally.

License

I confirm that this contribution is made under the terms of the MIT license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.82%. Comparing base (2dd721f) to head (98c7c6f).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #255   +/-   ##
=========================================
  Coverage     79.82%   79.82%           
  Complexity      287      287           
=========================================
  Files            31       31           
  Lines           897      897           
  Branches         88       88           
=========================================
  Hits            716      716           
  Misses          130      130           
  Partials         51       51           

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