Support supplied keys and RSACng for the cert generator

[mregen]

• Allow to call SetRSAPublicKey without Issuer being set
• Support to create self signed CA cert with supplied keys
• Test case for RSACng on .NET framework

Issue reported by @eoursel

[lgtm-com]

This pull request introduces 1 alert when merging dfb287c into 76afe82 - view on LGTM.com

new alerts:

• 1 for Missing Dispose call on local IDisposable

[lgtm-com]

This pull request introduces 1 alert when merging f2d9289 into 76afe82 - view on LGTM.com

new alerts:

• 1 for Missing Dispose call on local IDisposable

[lgtm-com]

This pull request introduces 1 alert when merging 7a85bcc into 76afe82 - view on LGTM.com

new alerts:

• 1 for Missing Dispose call on local IDisposable

[codecov]

Codecov Report

Merging #1507 (7a85bcc) into master (76afe82) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1507      +/-   ##
==========================================
+ Coverage   51.93%   51.95%   +0.02%     
==========================================
  Files         307      307              
  Lines       58332    58334       +2     
==========================================
+ Hits        30292    30305      +13     
+ Misses      28040    28029      -11     

Impacted Files	Coverage Δ
...Certificates/X509Certificate/CertificateBuilder.cs	83.70% <100.00%> (+0.18%)	⬆️
...braries/Opc.Ua.Server/Subscription/Subscription.cs	54.48% <0.00%> (+0.11%)	⬆️
...raries/Opc.Ua.Server/Subscription/MonitoredItem.cs	43.78% <0.00%> (+0.30%)	⬆️
Libraries/Opc.Ua.Client/Session.cs	61.04% <0.00%> (+0.36%)	⬆️
...tack/Opc.Ua.Core/Stack/Tcp/TcpTransportListener.cs	72.54% <0.00%> (+0.39%)	⬆️

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[mrsuciu]

Looks ok