fix(llc): Fix UpsertPushPreferencesResponse null values parsing

[VelikovPetar]

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Description of the pull request

We currently fail to parse null values in the UpsertPushPreferencesResponse.userPreferences map (when response is in the following format):

{
    user_preferences: {salvatore: null},
    user_channel_preferences: {salvatore: {messaging:!members-QOJWJvjGC-iBN9hHDdGMThtJxoUzR1kizb4pv-n0BtE: {chat_level: all}}},
    duration: "11.67ms"
}

Which is the response we get when we update channel-specific push preferences. In this case, the customer gets the error: Failed to set push preferences: type 'Null' is not a subtype of type 'Map<String, dynamic>' in type cast, even though the operation was successful.

The fix makes the parser more robust, allowing the user_preferences JSON to have null values.

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[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (v9@39b0c09). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...ckages/stream_chat/lib/src/core/api/responses.dart	80.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             v9    #2749   +/-   ##
=====================================
  Coverage      ?   65.96%           
=====================================
  Files         ?      425           
  Lines         ?    26931           
  Branches      ?        0           
=====================================
  Hits          ?    17765           
  Misses        ?     9166           
  Partials      ?        0           

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