Debounce first ChatEvents when subscribed with version (#792)

[SleepySquash]

Resolves #792

Synopsis

Из-за того, что на chatEvents может идти подписка с версией, отстающей от актуальной, поэтому события налетают один за другим, то показывая звонок, то его скрывая, то показывая какие-то вещи, то их скрывая, итд.

Solution

PR добавляет ивенты в список ивентов, которые затем по дебаунсу будут обработаны.

Checklist

• Created PR:
  • In draft mode
  • Name contains issue reference
  • Has type and k:: labels applied
• Before review:
  • Documentation is updated (if required)
  • Tests are updated (if required)
  • Changes conform code style
  • CHANGELOG entry is added (if required)
  • FCM (final commit message) is posted or updated
  • Draft mode is removed
• Review is completed and changes are approved
  • FCM (final commit message) is approved
• Before merge:
  • Milestone is set
  • PR's name and description are correct and up-to-date
  • All temporary labels are removed

[SleepySquash]

Requires #784, as otherwise all of the debounced events are just simply ignored, as this PR is useless.