* add sample to demonstrate plugins for ai agent * Update dotnet/samples/GettingStarted/Agents/Agent_Step15_Plugins/Program.cs Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Update dotnet/samples/GettingStarted/Agents/Agent_Step15_Plugins/Program.cs Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Update dotnet/samples/GettingStarted/Agents/Agent_Step15_Plugins/Program.cs Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * remove lang version property * address review comments * rename functionInvocationServices to services * restore the solution file corrupted during the merge with lates main --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>