SDK-49: add description to EventHandler

[IvanKulik-sm]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
Conductor/Client/Models/EventHandler.cs	0.00%	3 Missing ⚠️

Flag	Coverage Δ
unittests	21.05% <0.00%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
Conductor/Client/Models/EventHandler.cs	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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[KonstantinVoytovich-sm]

LGTM