CUST-5203: add "maybe" to Event Status, use "maybe" instead of deprecated "tentative", and gracefully handle unknown status

[googsvg]

Add "maybe" as an Event Status, and also add a graceful handler of unknown returned events instead of crashing with unknown JsonDataException (as described in the ticket).

Also, "maybe" is the new standard for Event Status instead of "tentative" (which will be deprecated one time in the future).

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

❌ Patch coverage is 42.85714% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.38%. Comparing base (76e3a87) to head (a1c4a29).

Files with missing lines	Patch %	Lines
...in/kotlin/com/nylas/util/EventStatusJsonAdapter.kt	38.46%	5 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #307      +/-   ##
============================================
- Coverage     82.93%   82.38%   -0.56%     
- Complexity      348      354       +6     
============================================
  Files            36       37       +1     
  Lines          1002     1016      +14     
  Branches         94       95       +1     
============================================
+ Hits            831      837       +6     
- Misses          115      120       +5     
- Partials         56       59       +3     

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