[Python] Restore PythonServerOperationErrorGenerator extending from ServerOperationErrorGenerator

[pose]

As part of the #2336 refactor, PythonServerOperationErrorGenerator no longer extends/inherits from ServerOperationErrorGenerator:

class PythonServerOperationErrorGenerator(
    private val model: Model,
    private val symbolProvider: RustSymbolProvider,
    private val operation: OperationShape,
- ) : ServerOperationErrorGenerator(model, symbolProvider, symbolProvider.toSymbol(operation), listOf()) {
- 
+ ) {
    private val operationIndex = OperationIndex.of(model)
    private val errors = operationIndex.getErrors(operation)

Each time we change ServerOperationErrorGenerator we now need to remember to mirror the same changes on PythonServerOperationErrorGenerator which is a rather fragile process and quite likely to be missed.

Unfortunately, we cannot simply extend from ServerOperationErrorGenerator as its render method is not open. How can we make PythonServerOperationErrorGenerator extend from ServerOperationErrorGenerator on a way we could override the required behavior for the Python and TypeScript cases?

[crisidev]

I'll assign this to me as I can bundle this up with a couple of bugfixing I am working on.

[jdisanti]

I think we should make ServerOperationErrorGenerator configurable like we do with the things in codegen-core, and break away from the inheritance to override mentality.

[crisidev]

I am of the opposite opinion here. We want to be able to piggy back on as much code as we can from the Rust server implementation for Python and other languages and inheritance seems to me to be filling this gap perfectly.

[hlbarber]

One thing to consider here is that we don't always need to extend the Rust generators to TypeScript/Python generators if we're leaving the Rust code intact and just adding code. Instead we can extend the shape visitor so that we call extra, completely separate, generators.

Examples: here and here

[crisidev]

I think this can be closed, I refactored the code and the inheritance is not really needed here.