Extend ServerConfiguration for ECC

[romanett]

Proposed changes

Extend ConfigurationNode Manager to support multiple Application Certificates & be able to regenerate the private Key of ECC Certificates. Add Trust List Support for User Certificates & Https Certificates.

Related Issues

• Fixes #

Types of changes

• 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

• 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

[codecov]

Codecov Report

Attention: Patch coverage is 78.78788% with 14 lines in your changes missing coverage. Please review.

Project coverage is 55.37%. Comparing base (b2d715d) to head (88878e6).

Files with missing lines	Patch %	Lines
...a.Server/Configuration/ConfigurationNodeManager.cs	76.00%	8 Missing and 4 partials ⚠️
...raries/Opc.Ua.Configuration/ApplicationInstance.cs	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2817      +/-   ##
==========================================
- Coverage   55.70%   55.37%   -0.33%     
==========================================
  Files         352      352              
  Lines       67332    67360      +28     
  Branches    13806    13810       +4     
==========================================
- Hits        37506    37302     -204     
- Misses      25792    25980     +188     
- Partials     4034     4078      +44     

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