D Programming: How to Define and Use Custom Attributes

[Soham Mukherjee]

I'm exploring the D programming language and I'm curious about 
custom attributes. How can I define and use custom attributes in 
D to add metadata or behavior to my code?

For example, let's say I want to create a custom attribute 
@MyCustomAttribute that I can apply to functions or types. How do 
I define this attribute, and how can I use it to influence the 
behavior of my D code?

It would be helpful if you could provide code examples and 
explain how custom attributes can be leveraged in practical 
scenarios within D programming. Thank you for your insights!