We now have an overview of traits, how to define them and how they work, now it's time to put that knowledge to use and build a plugin system using traits.

A plugin in this system is any type that implements a specific trait. Each plugin will perform a specific task, and the system should manage a collection of these plugins, executing them in sequence. You’ll also address advanced issues like object safety and resolving potential conflicts between overlapping trait implementations.

Design and implement a plugin system using trait objects. You will:

1. Define a Plugin trait that includes methods for initialization and execution.
2. Create a PluginManager struct to manage plugins. It should:
   • Dynamically load plugins implementing the Plugin trait.
   • Allow adding and removing plugins.
   • Execute all registered plugins in sequence.

• The Plugin trait should include the following methods:
  • fn name(&self) -> &str; - Returns the name of the plugin.
  • fn execute(&self); - Executes the plugin's functionality.
• The PluginManager should:
  • Have the following methods and associated functions:
    • new() -> Self - Creates a new PluginManager instance.
    • add_plugin - Adds a plugin to the list.
    • remove_plugin - Removes a plugin from the list.
    • execute_all - Executes all registered plugins.
• If a duplicate plugin is added (with the same name), it should panic.

Make sure you make all relevant items public.