Scheduler API Support

[SubashPradhan]

This PR adds support to the scheduler API, this includes managing configurations, sessions, and bookings.

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

Attention: Patch coverage is 92.85714% with 5 lines in your changes missing coverage. Please review.

Project coverage is 81.28%. Comparing base (7b99eec) to head (08b9fd0).

Files with missing lines	Patch %	Lines
src/main/kotlin/com/nylas/resources/Scheduler.kt	0.00%	4 Missing ⚠️
src/main/kotlin/com/nylas/NylasClient.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #252      +/-   ##
============================================
+ Coverage     79.82%   81.28%   +1.46%     
- Complexity      287      316      +29     
============================================
  Files            31       35       +4     
  Lines           897      967      +70     
  Branches         88       88              
============================================
+ Hits            716      786      +70     
+ Misses          130      129       -1     
- Partials         51       52       +1     

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