Design differences between Tools/Prompts vs Resources

Hi, I am trying to understand why tools and prompts use inheritance, but resources don't.

For example, couldn't resources look something like this:

```ruby
class ExampleResource < MCP::Resource
 uri "https://example.com/my_resource"
 name "My Resource"
 description "Lorem ipsum dolor sit amet"
 mime_type "text/html"

 class << self
 def call(params:)
 # ...
 end
 end
end
```
