Allow custom event's attribute values to have a configurable size #1612

[meiao]

Overview

Following the agent specs, this PR allows the size of custom event's attributes to be configurable. It uses the current size (255) by default.

Related Github Issue

#1612

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (da6c37f) 70.71% compared to head (6ed3bc3) 70.70%.
Report is 9 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1683      +/-   ##
============================================
- Coverage     70.71%   70.70%   -0.02%     
+ Complexity    10062     9965      -97     
============================================
  Files           830      830              
  Lines         40175    39984     -191     
  Branches       6093     6049      -44     
============================================
- Hits          28411    28270     -141     
+ Misses         9022     8984      -38     
+ Partials       2742     2730      -12     

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