Add support for generic "pseudocode"

[FuadEfendi]

Is there an existing issue for this?

• I have searched the existing issues

What is the missing lexer?

It should support mix of approaches: SQL, Procedural, Object Oriented, Functional; something generic.

This is example:

  ```pseudocode
  class Subject:
      observers: List<Observer>

      def attach(observer: Observer)
          observers.add(observer)

      def detach(observer: Observer)
          observers.remove(observer)

      def notify()
          for each observer in observers
              observer.update()

  class ConcreteObserver implements Observer:
      def update()
          // Handle the update
  ```

 class Subject:
     observers: List<Observer>

     def attach(observer: Observer)
         observers.add(observer)

     def detach(observer: Observer)
         observers.remove(observer)

     def notify()
         for each observer in observers
             observer.update()

 class ConcreteObserver implements Observer:
     def update()
         // Handle the update

Links to existing syntax definitions

N/A