[ObjC] Parse and create struct types within type encoding strings

[bdash]

Version and Platform (required):

• Binary Ninja Version: 5.3.8651-dev Ultimate, 61182526
• OS: macos
• OS Version: 26.1
• CPU Architecture: arm64

Bug Description:
Instance variables of struct types have a type string formatted as {structTypeName="firstFieldName"firstFieldType"secondFieldName"secondFieldType"}

ObjCProcessor currently skips parsing the contents of the {…} and replaces the field with a void*.

Here are a couple of example seen in /usr/libexec/locationd on macOS 26.1:

100895648  struct objc_ivar_list_t ivar_list_CLDaemonStatusStateTracker = 
100895648  {
100895648      uint32_t entsize = 0x20
10089564c      uint32_t count = 0x3
100895650  }
100895650  struct objc_ivar_t ivar__state = 
100895650  {
100895650      uint32_t* offset = data_1008b590c
100895658      char* name = ivarName__state {"_state"}
100895660      char* type = ivarType__state {"{_CLDaemonStatusStateTrackerState="batteryData"{Battery="level"d"charged"B"connected"B"chargerType"i"wasConnected"B"chargerFamily"i}"reachability"i"thermalLevel"i"thermalPressure"i"airplaneMode"B"batterySaverModeEnabled"B"restrictedMode"B}"}
100895668      uint32_t alignment = 0x3
10089566c      uint32_t size = 0x28
100895670  }

The ivar should end up as struct _CLDaemonStatusStateTrackerState _state with:

struct _CLDaemonStatusStateTrackerState
{
    struct
    {
        double level;
        bool charged;
        bool connected;
        int32_t chargerType;
        bool wasConnected;
        int32_t chargerFamily;
    } batteryData;
    int32_t reachability;
    int32_t thermalLevel;
    int32_t thermalPressure;
    bool airplaneMode;
    bool batterySaverModeEnabled;
    bool restrictedMode;
};

100893640  struct objc_ivar_t ivar__mostRecentVehicleState = 
100893640  {
100893640      uint32_t* offset = data_1008b57f8
100893648      char* name = ivarName__mostRecentVehicleState {"_mostRecentVehicleState"}
100893650      char* type = ivarType__mostRecentVehicleState {"{?="version"C"timestamp"Q"state"I"confidence"C"hints"S}"}
100893658      uint32_t alignment = 0x0
10089365c      uint32_t size = 0x10
100893660  }

This should be struct { unsigned char version; unsigned long long timestamp; unsigned int state; unsigned char confidence; unsigned short hints; } _mostRecentVehicleState;

100893660  struct objc_ivar_t ivar__wifiServiceClient = 
100893660  {
100893660      uint32_t* offset = data_1008b57f4
100893668      char* name = ivarName__wifiServiceClient {"_wifiServiceClient"}
100893670      char* type = ivarType__wifiServiceClient {"{unique_ptr<CLWifiService_Type::Client, std::default_delete<CLWifiService_Type::Client>>="__ptr_"^{Client}}"}
100893678      uint32_t alignment = 0x3
10089367c      uint32_t size = 0x8
100893680  }

This should be struct unique_ptr<CLWifiService_Type::Client, std::default_delete<CLWifiService_Type::Client>> _wifiServiceClient; with

struct unique_ptr<CLWifiService_Type::Client, std::default_delete<CLWifiService_Type::Client>> {
    struct Client *__ptr_;
};

Binary:

alert glade matches well