*DRAFT* Add EventMonitoredItem comfort

[KircMax]

Proposed changes

This is not a proposal yet.
I just want to create a discussion basis in order to from that create a Pull Request that contains these changes in a way it will be okay to include this into the repository.
I just copied some Extensions I have currently build up on top of the MonitoredItem that make Event Handling easier for me.

Related Issues

• Fixes A&C Enhancements for the Client #2492

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply. You can also fill these out after creating the PR.

• Bugfix (non-breaking change which fixes an issue)
• Enhancement (non-breaking change which adds functionality)
• Test enhancement (non-breaking change to increase test coverage)
• Breaking change (fix or feature that would cause existing functionality to not work as expected, requires version increase of Nuget packages)
• Documentation Update (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have read the CONTRIBUTING doc.
• I have signed the CLA.
• I ran tests locally with my changes, all passed.
• I fixed all failing tests in the CI pipelines.
• I fixed all introduced issues with CodeQL and LGTM.
• I have added tests that prove my fix is effective or that my feature works and increased code coverage.
• I have added necessary documentation (if appropriate).
• Any dependent changes have been merged and published in downstream modules.

Further comments

I just want to kick off the discussion for how this could be done.
This is absolutely not final.

[codecov]

Codecov Report

Attention: Patch coverage is 4.66667% with 143 lines in your changes missing coverage. Please review.

Project coverage is 54.35%. Comparing base (3f29a72) to head (9616b83).
Report is 117 commits behind head on master.

Files with missing lines	Patch %	Lines
Libraries/Opc.Ua.Client/MonitoredItem.cs	14.28%	40 Missing and 2 partials ⚠️
Libraries/Opc.Ua.Client/Methods/MethodBase.cs	0.00%	38 Missing ⚠️
Libraries/Opc.Ua.Client/Events/Extensions.cs	0.00%	27 Missing ⚠️
Libraries/Opc.Ua.Client/Events/OpcEvent.cs	0.00%	12 Missing ⚠️
....Client/Events/OpcUaEventFieldNotFoundException.cs	0.00%	10 Missing ⚠️
...ies/Opc.Ua.Client/Methods/EventMethodCollection.cs	0.00%	4 Missing ⚠️
...ies/Opc.Ua.Client/Methods/MethodCallReturnValue.cs	0.00%	4 Missing ⚠️
Libraries/Opc.Ua.Client/Methods/EventMethod.cs	0.00%	3 Missing ⚠️
Libraries/Opc.Ua.Client/Events/EventField.cs	0.00%	2 Missing ⚠️
Libraries/Opc.Ua.Client/Methods/OutputArgument.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2543      +/-   ##
==========================================
- Coverage   54.55%   54.35%   -0.21%     
==========================================
  Files         335      344       +9     
  Lines       64749    64899     +150     
  Branches    13292    13312      +20     
==========================================
- Hits        35325    35273      -52     
- Misses      25594    25785     +191     
- Partials     3830     3841      +11     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.