Support use of opc.https endpoint url for client and server.

[mregen]

Proposed changes

Currently the https protocol doesn't support a spec compliant endpoint with a opc.https prefix., as client and server.
Fix:

• Add the client and server support for the opc.https prefix.
• Continue support for https prefix for non compliant implementations.
• Any CancellationTokenSource should be disposed after being used.
• Follow coding guidelines

Related Issues

• Fixes Resource leak possibility due to not disposing of CancellationTokenSource with Timer #2138

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.

[codecov]

Codecov Report

Merging #2140 (56880f9) into master (29a3be5) will decrease coverage by 0.04%.
The diff coverage is 66.08%.

❗ Current head 56880f9 differs from pull request most recent head f2c56ee. Consider uploading reports for the commit f2c56ee to get more accurate results

@@            Coverage Diff             @@
##           master    #2140      +/-   ##
==========================================
- Coverage   57.97%   57.93%   -0.04%     
==========================================
  Files         324      324              
  Lines       61680    61718      +38     
==========================================
- Hits        35756    35755       -1     
- Misses      25924    25963      +39     

Impacted Files	Coverage Δ
...Ua.Core/Stack/Configuration/ConfiguredEndpoints.cs	24.09% <0.00%> (-0.45%)	⬇️
...a.Core/Stack/Transport/TransportChannelSettings.cs	100.00% <ø> (ø)
...Ua.Core/Stack/Configuration/EndpointDescription.cs	60.00% <16.66%> (ø)
Stack/Opc.Ua.Core/Stack/Server/ServerBase.cs	71.67% <60.00%> (-0.32%)	⬇️
...ndings.Https/Stack/Https/HttpsTransportListener.cs	71.27% <66.66%> (-4.42%)	⬇️
....Ua.Bindings.Https/Stack/Https/HttpsServiceHost.cs	85.41% <81.48%> (-0.30%)	⬇️
...indings.Https/Stack/Https/HttpsTransportChannel.cs	82.03% <87.23%> (+0.27%)	⬆️
Stack/Opc.Ua.Core/Stack/Client/DiscoveryClient.cs	67.66% <100.00%> (-10.53%)	⬇️
Stack/Opc.Ua.Core/Stack/Client/UaChannelBase.cs	21.57% <100.00%> (-0.53%)	⬇️
Stack/Opc.Ua.Core/Types/Utils/Utils.cs	58.71% <100.00%> (+0.13%)	⬆️

... and 12 files with indirect coverage changes

[mregen]

some issue still arises with macOS...