Add custom derives for specific generated types (#520)

* WIP implement custom derives per type

* WIP wiring up specific type derives

* Fmt

* Rename GeneratedTypeDerives to Derives

* Fmt

* Fix errors

* Fix test runtime

* Make derives appear in alphabetic order

* Clippy

* Add derive_for_type attribute to example

* Add docs to example

* Rename GeneratedTypeDerive

* Rename ty to type in attribute

* Update darling

* Update codegen/src/types/derives.rs

Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>

* Update codegen/src/types/mod.rs

Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>

* Update codegen/src/types/mod.rs

Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>

* review: update method name

* Add unit tests for combined derives

* Remove out of date docs

* Add macro usage docs

Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>

codegen/src/lib.rs

@@ -26,7 +26,8 @@ pub use self::{
         RuntimeGenerator,
     },
     types::{
-        GeneratedTypeDerives,
+        Derives,
+        DerivesRegistry,
         Module,
         TypeGenerator,
     },