Fix regression in Kotlin error/exception names.

[mhammond]

Fixes #1828.

I'm frustrated with myself that I left this so broken - I think I was trying to avoid this larger Kotlin refactor that is sadly necessary. I ended up forking CodeType as only Kotlin needs error renaming.

[bendk]

Looks good to me. I had one nit about the module visibility, but I think that can go either way.

[bendk]

It's not a big deal either way, but I'd lean towards keeping these pub.

For one, it'll make the PR smaller, but I also generally prefer that functions are either public or private. If we don't want outside code to access these methods, then we can make gen_python a private module. If we need more complicated access control, we can selectively import its public functions into the parent module.

[mhammond]

Ah yeah - this was needed before I "unforked" otherwise I got errors about leaking private types. Note AsCodeType is again pub I can remove this for python!

[mhammond]

oops, I was wrong - I unforked that trait, but Python is still using the fork. Without this I get:

385 | trait AsCodeType {
    | ---------------- `gen_python::AsCodeType` declared as private
...
443 |     pub fn type_name(as_ct: &impl AsCodeType) -> Result<String, askama::Error> {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't leak private trait

(which TBH I don't quite understand seeing as the filters module, while nominally pub isn't actually exported anywhere.)

[mhammond]

(and trying to make the trait itself pub then confuses even more things)

[bendk]

Ahh I see, then pub(super) makes sense to me.

[kp-timo-beyel]

This is still broken in 0.25.2 if the nested error is declared in an external crate.

#[derive(uniffi::Error, thiserror::Error, PartialEq)]
pub enum TokenError {
    /// There was an error performing the API Request
    #[error("tokens.error.apirequest")]
    ApiError {
        #[from]
        source: kp_api_requests::error::ApiRequestError,
    },

This results in the type to be renamed from ApiRequestError to ApiRequestException
sealed class ApiRequestException: Exception() {

but the import not reflecting this

import com.sdk.api_requests.ApiRequestError