feat(ui, core, localization): Add Poll attachment interactor

[xsahil03x]

This pull request includes significant updates to the poll feature in the stream_chat package, focusing on enhancing poll functionality and improving data consistency. The changes introduce new methods for managing polls, update existing methods to use synchronization locks, and modify data models to better reflect poll states and votes.

Enhancements to Poll Functionality:

• Added new methods for managing polls, including deletePoll, closePoll, createPollOption, castPollVote, addPollAnswer, removePollVote, and queryPollVotes in the Channel class. These methods are synchronized using _pollLock and _pollVoteLock to ensure thread safety. [1] [2] [3]

Data Model Updates:

• Updated the Poll class to replace answers and votesByOption with latestAnswers and latestVotesByOption respectively. Added new computed properties latestVotes, ownVotes, and ownAnswers to provide clearer access to poll data. [1] [2] [3] [4] [5] [6]

Synchronization Improvements:

• Introduced _pollLock and _pollVoteLock in the Channel class to synchronize poll-related operations, ensuring that poll actions are thread-safe. [1] [2] [3]

Event Handling:

• Added new event type pollDeleted to the EventType class to handle poll deletion events.

Testing and Documentation:

• Updated tests in poll_test.dart to reflect changes in the Poll data model, ensuring that the new properties and methods are correctly tested. [1] [2] [3]
• Added a new file poll_voting_mode.dart to define different voting modes for polls, enhancing the flexibility of poll configurations.

These changes collectively enhance the robustness and flexibility of poll management within the stream_chat package, ensuring better data integrity and improved functionality.

[codecov]

Codecov Report

Attention: Patch coverage is 53.18656% with 808 lines in your changes missing coverage. Please review.

Project coverage is 60.59%. Comparing base (714a194) to head (c3f9988).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...t_flutter/lib/src/theme/poll_interactor_theme.dart	16.88%	128 Missing ⚠️
...core/lib/src/stream_poll_vote_list_controller.dart	0.00%	96 Missing ⚠️
...utter/lib/src/theme/poll_results_dialog_theme.dart	21.64%	76 Missing ⚠️
.../lib/src/poll/stream_poll_option_votes_dialog.dart	0.00%	65 Missing ⚠️
...tter/lib/src/poll/stream_poll_comments_dialog.dart	0.00%	59 Missing ⚠️
.../lib/src/theme/poll_option_votes_dialog_theme.dart	18.57%	57 Missing ⚠️
...l_vote_scroll_view/stream_poll_vote_list_view.dart	0.00%	54 Missing ⚠️
...tter/lib/src/theme/poll_comments_dialog_theme.dart	19.67%	49 Missing ⚠️
packages/stream_chat/lib/src/client/channel.dart	0.00%	48 Missing ⚠️
...utter/lib/src/theme/poll_options_dialog_theme.dart	26.78%	41 Missing ⚠️
... and 17 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2052      +/-   ##
==========================================
- Coverage   61.14%   60.59%   -0.56%     
==========================================
  Files         336      356      +20     
  Lines       20152    21846    +1694     
==========================================
+ Hits        12322    13237     +915     
- Misses       7830     8609     +779     

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[sachaarbonel]

LGTM