* Developers intro how to contribute
* Fix Rust code generation for Rust edition 2024
The errors look like:
```
warning[E0133]: call to unsafe function `fbs::flatbuffers::emplace_scalar` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `fbs::flatbuffers::follow_cast_ref` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `fbs::flatbuffers::Follow::follow` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `fbs::flatbuffers::read_scalar_at` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `fbs::flatbuffers::root_unchecked` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `fbs::flatbuffers::size_prefixed_root_unchecked` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `fbs::flatbuffers::Table::<'a>::new` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `std::slice::from_raw_parts` is unsafe and requires unsafe block
```
* Update goldens
Ran `goldens/generate_goldens.py`
* Regenerate code files
Ran `scripts/generate_code.py`
* Set an explicit 2018 edition for Rust tests
* Replace all `std` usage with `core` and `alloc` in Rust code generator
* Update the generated files
* Make Rust tests actually use no_std when the corresponding feature is enabled
* fix for rust build
* Rust: Implement Serialize on generated types
For debugging convenience it is really handy to be able to dump out
types as another format (ie: json). For example, if we are logging a
type to a structured logging system, or even printing it out in a
structured way to the console.
Right now we handle this by shelling out to `flatc` which is not ideal;
by implementing Serialize on the generated types we can use any of the
Serializer-implementing packages for our structured debug output.
* clang-format
* Make the flatbuffers Rust crate only have an optional dependency on the `serde` packages.
* fix warning
* fix rust test build
* Oh yeah this needs to be initialized
* fix toml syntax
* code review feedback
* rebuild test data
