WIP [ffigen] Config update part 5: trivial fields

[liamappelbe]

Migrate a whole bunch of easy fields from the old Dart config API to the new AST pattern:

• Enums.style -> EnumClass.style
• Enums.silenceWarning -> EnumClass.silenceWarning
• Functions/Globals.includeSymbolAddress -> Func/Global.exposeSymbolAddress
• Functions.isLeaf -> Func.isLeaf
• Functions.recordUse -> Func.recordUse
• Structs/Unions.dependencies -> Struct/Union.dependencies
• Structs.packingOverride -> Struct.pack
• Typedefs.useSupportedTypedefs -> true
• Interfaces/Protocols.module -> ObjCInterface/ObjCProtocol.module

[github-actions]

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