Improve https protocol support

[mregen]

• add support for security header in client/server libs
  fixes 'OPCUA-SecurityPolicy' header not created in HTTPS connection #1118

[codecov]

Codecov Report

Merging #1490 (dd9a0ae) into master (73e0e59) will decrease coverage by 0.02%.
The diff coverage is 62.50%.

@@            Coverage Diff             @@
##           master    #1490      +/-   ##
==========================================
- Coverage   51.84%   51.82%   -0.03%     
==========================================
  Files         305      305              
  Lines       58044    58637     +593     
==========================================
+ Hits        30095    30390     +295     
- Misses      27949    28247     +298     

Impacted Files	Coverage Δ
...ndings.Https/Stack/Https/HttpsTransportListener.cs	68.15% <53.84%> (-1.51%)	⬇️
...indings.Https/Stack/Https/HttpsTransportChannel.cs	66.21% <100.00%> (+0.69%)	⬆️
...raries/Opc.Ua.Server/Subscription/MonitoredItem.cs	44.09% <0.00%> (+0.30%)	⬆️
Libraries/Opc.Ua.Client/Session.cs	61.05% <0.00%> (+0.41%)	⬆️
Stack/Opc.Ua.Core/Types/Utils/TypeInfo.cs	41.00% <0.00%> (+3.86%)	⬆️

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[mregen]

Thanks @mrsuciu, please stay tuned -- will add some more 'negative' test cases to validate security header...

[mregen]

only manual validation w. other clients..