Added usage of ReadEventHandler as functional interface

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Project coverage is 58.71%. Comparing base (b81b4d7) to head (c96dfe7).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...a/tech/ydb/topic/read/events/ReadEventHandler.java	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #485   +/-   ##
=========================================
  Coverage     58.71%   58.71%           
- Complexity     2178     2179    +1     
=========================================
  Files           323      324    +1     
  Lines         13067    13071    +4     
  Branches       1278     1278           
=========================================
+ Hits           7672     7675    +3     
- Misses         4772     4773    +1     
  Partials        623      623           

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