Make the Front End Easily Swappable and Declaratively Specified in a Very Productive Language Oriented Programming way

[sirinath]

Not immediately make the front end swappable and declaratively specified in some version of Mojo.

This way it will be very easy to use it as a front end for other languages so that this code can be used without overhead and complexity of FFIs and even prototype and implement new Python versions without much effort.

Initial efforts can be directed at:

• C/C++
• Rust
• Ruby
• Fortran
• Julia
• Matlab
• Java
• C#
• Ada
• F#
• Haskell
• OCaml
• SML
• etc.

This way code written in these languages can be directly integrated into Mojo without FFI and compiled along side it in a unified way while also benefiting from Mojo's optimisations.