Add support for Google Calendar color_id field on Events

[burtonrhodes]

Summary

• Adds colorId field to Event, CreateEventRequest, and UpdateEventRequest models, mapped to the color_id JSON property
• Adds colorId(String) builder methods on the create/update request builders
• Currently only applies to Google Calendar events (see Google Calendar Colors)

Test plan

• Updated EventsTests to assert color_id is deserialized on event fetch
• Updated create/update event serialization tests to include colorId
• Verify ./gradlew test passes locally

License

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Note

Low Risk
Additive, optional model field and builder setters with test coverage; minimal behavioral change aside from extra JSON property when provided.

Overview
Adds first-class support for Google Calendar event colors by introducing an optional colorId field on Event, CreateEventRequest, and UpdateEventRequest, mapped to the color_id JSON property.

Extends the create/update request builders to set colorId, updates the changelog, and expands EventsTests to cover color_id serialization/deserialization and omission when unset (including clearing via null on the update builder).

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.47%. Comparing base (ded101e) to head (b934968).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #314   +/-   ##
=========================================
  Coverage     82.47%   82.47%           
  Complexity      357      357           
=========================================
  Files            37       37           
  Lines          1027     1027           
  Branches         95       95           
=========================================
  Hits            847      847           
  Misses          121      121           
  Partials         59       59           

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[googsvg]

@burtonrhodes thank you so much for your contribution ❤️

we appreciate community suggestions and updates, so this is more than welcome PR :)

it will be released with next SDK deployment, soon :)

[burtonrhodes]

@googsvg Of course! Will be glad to use in the next release. My users have been wanting this for a while.