ECF v1.0.6 - Hosted Services, User Secrets & .NET 9 support

Changelog:

• added EasyConsoleFramework.HostedServices to enable hosting services in background
  • need additional nuget package to work
  • added to base package two configuration methods that can invoke user-defined function on start and on stop of ECF host
• added UserSecrets when using AddConfiguration(...) on ECF builder
• added references to .NET 9