Auto-generate enum type widget boilerplate for radio buttons and dropdown menus (#2589)

* First draft of factoring out the dropdown boilerplate

* Add proc macro for enum boilerplate

* Detect whether to say `crate` or the name

* Clean up the input and naming of the enum macro

* Rename a file

* Do the rename of code too

* Use the attribute-driven selection of radio vs dropdown

* Add a metadata struct and tooltips

* Move the new traits to a better place.

* Use ChoiceType, part 1

* Use ChoiceType, part 2

* Introduce a builder API for choice widgets

* Start using the new new API

* DomainWarpType should be a dropdown still

* Handle the case where a node property can never have a socket

* Rustfmt

* Code review

* Update stable node IDs in test

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Co-authored-by: Keavon Chambers <keavon@keavon.com>

proc-macros/Cargo.toml

@@ -23,6 +23,7 @@ serde-discriminant = []
 proc-macro2 = { workspace = true }
 syn = { workspace = true }
 quote = { workspace = true }
+convert_case = { workspace = true }
 
 [dev-dependencies]
 # Local dependencies