[Python, WIP] Build Python AST using CEs

[dbrattli]

• More experimentation of generating Python AST using F# CEs
• Removes a lot of boilerplate code and clutter by hiding the statements "threading" though the code
• How far can we / should we go?

[MangelMaxime]

I always have a problem/fear with CEs DSL in F# because the more CEs we have or the more complex they are, the slower F# compiler becomes...

dotnet/fsharp#14429

[dbrattli]

Thanks for the warning @MangelMaxime. Then I might not go all-in, and just leave it for the outer boundary to hide the statement "threading" in the expression building of Fable2Python, and instead use "normal" functions/methods on the inside.

[MangelMaxime]

Your welcome, I always feel like the "bad guy" when someone create a new CEs DSL as I often point this performance issue 😅

I would love for it to be fixed, but looking at the issue comment it seems like a lot of work ...