Enum naming improvements

[yodaldevoid]

This improves the interaction between #[pyclass(name)] and enums.

First, the macro-defined name for the enum is used in the enum's __repr__ implementation so that everything is kept consistent from the Python point of view.

Secondly, #[pyo3(name)] is now supported on enum variants.

[messense]

I think it's better to name some struct and fns enum variant instead of just variant.

[yodaldevoid]

I think it's better to name some struct and fns enum variant instead of just variant.

I've applied the naming suggestions.

[davidhewitt]

Thanks very much for this, and sorry I have been slow to review.

Implementation is very complete and docs are great 👍

Just one tiny tweak I'd like to see to contain the options inside the PyClassEnumVariant struct (if it's straightforward to do so). Also need to rebase to fix the CHANGELOG merge conflict. Then let's merge!

[yodaldevoid]

I've incorporated the suggested changes and fixed the merge conflict in the CHANGELOG.

[messense]

error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> pyo3-macros-backend/src/pyclass.rs:337:5
|
337|     fn python_name<'b>(&'b self) -> Cow<'b, syn::Ident> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: `-D clippy::needless-lifetimes` implied by `-D warnings`
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes

There is a clippy warning needs to be addressed.

[yodaldevoid]

There is a clippy warning needs to be addressed.

Apologies, I forgot to run clippy before pushing. This should now be addressed.

[davidhewitt]

Looks great - many thanks again!