feat: symmetric createMonitoredItemDataChange, deleteMonitoredItem

[lukasberbuer]

Symmetric implementation (same definition for Server and Client) for:

• services::createMonitoredItemDataChange
• services::deleteMonitoredItem

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 85.12%. Comparing base (dc7c732) to head (846edf4).

Files	Patch %	Lines
src/services/MonitoredItem.cpp	87.50%	0 Missing and 4 partials ⚠️
include/open62541pp/MonitoredItem.h	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #238      +/-   ##
==========================================
- Coverage   85.14%   85.12%   -0.03%     
==========================================
  Files          80       80              
  Lines        4356     4355       -1     
  Branches     1746     1760      +14     
==========================================
- Hits         3709     3707       -2     
+ Misses        204      202       -2     
- Partials      443      446       +3     

Flag	Coverage Δ
Linux	85.12% <88.88%> (-0.03%)	⬇️

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