deps: added KeyManagement as nuget dependency

.gitlab-ci.yml

.reuse/dep5

FitConnect.sln

FitConnect/FitConnect.csproj

FitConnect/Models/SendableReply.cs

FitConnect/Sender.cs

FitConnect/Services/Models/v1/Api/ReplyChannel.cs

FitConnect/Subscriber.cs

JwkGenerator/JwkGenerator.csproj

KeyManagement/Base64UrlEncoder.cs

KeyManagement/Generator.cs

KeyManagement/JsonWebKey.cs

KeyManagement/KeyManagement.csproj

KeyManagement/Program.cs

KeyManagement/README.md

KeyManagement/icon.png

Tests/E2ETest/ReplyChannelTest.cs