feat(ios) add ability to set CallKit options for incoming calls

The implemented options are the call handle and UUID.

ios/sdk/src/JitsiMeetConferenceOptions.h

 - (void)setFeatureFlag:(NSString *_Nonnull)flag withBoolean:(BOOL)value;
 - (void)setFeatureFlag:(NSString *_Nonnull)flag withValue:(id _Nonnull)value;
 
+/**
+ * CallKit call handle, to be used when implementing incoming calls.
+ */
+@property (nonatomic, copy, nullable) NSString *callHandle;
+
+/**
+ * CallKit call UUID, to be used when implementing incoming calls.
+ */
+@property (nonatomic, copy, nullable) NSUUID *callUUID;
+
 @end
 
 @interface JitsiMeetConferenceOptions : NSObject
 
 @property (nonatomic, nullable) JitsiMeetUserInfo *userInfo;
 
+@property (nonatomic, copy, nullable, readonly) NSString *callHandle;
+@property (nonatomic, copy, nullable, readonly) NSUUID *callUUID;
+
 + (instancetype _Nonnull)fromBuilder:(void (^_Nonnull)(JitsiMeetConferenceOptionsBuilder *_Nonnull))initBlock;
 - (instancetype _Nonnull)init NS_UNAVAILABLE;
 

ios/sdk/src/JitsiMeetConferenceOptions.m

         _videoMuted = nil;
 
         _userInfo = nil;
+
+        _callHandle = nil;
+        _callUUID = nil;
     }
     
     return self;
         _featureFlags = [NSDictionary dictionaryWithDictionary:builder.featureFlags];
 
         _userInfo = builder.userInfo;
+
+        _callHandle = builder.callHandle;
+        _callUUID = builder.callUUID;
     }
 
     return self;
     if (_subject != nil) {
         config[@"subject"] = self.subject;
     }
+    if (_callHandle != nil) {
+        config[@"callHandle"] = self.callHandle;
+    }
+    if (_callUUID != nil) {
+        config[@"callUUID"] = [self.callUUID UUIDString];
+    }
 
     NSMutableDictionary *urlProps = [[NSMutableDictionary alloc] init];