C++ codegen of structs and unions

.clang-format

@@ -12,10 +12,12 @@ AlwaysBreakBeforeMultilineStrings: true
 BinPackArguments: false
 ColumnLimit: 100
 ContinuationIndentWidth: 4
+EmptyLineBeforeAccessModifier: LogicalBlock
 IndentWidth: 4
 IndentWrappedFunctionNames: true
 InsertTrailingCommas: Wrapped
 MaxEmptyLinesToKeep: 1
 NamespaceIndentation: All
 PointerAlignment: Left
+SeparateDefinitionBlocks: Always
 SpacesBeforeTrailingComments: 1

crates/re_types/source_hash.txt

@@ -1,4 +1,4 @@
 # This is a sha256 hash for all direct and indirect dependencies of this crate's build script.
 # It can be safely removed at anytime to force the build script to run again.
 # Check out build.rs to see how it's computed.
-d5ccdc80e148c8058d3885418f9c701fbae4a5fbb92defb9bd625ad27ed97a25
+289571cd5bcef516a43ead1678f39054c300890396d13933dc26d9294a07dffe

crates/re_types_builder/src/arrow_registry.rs

@@ -300,7 +300,7 @@ impl From<DataType> for LazyDatatype {
             DataType::Extension(name, datatype, metadata) => {
                 LazyDatatype::Extension(name, Box::new((*datatype).into()), metadata)
             }
-            _ => unimplemented!("{datatype:#?}"), // NOLINT
+            _ => unimplemented!("{datatype:#?}"),
         }
     }
 }