Rename controller:isSuspended to make it clearer that it's notifying about a state change. (#35577)

Author: bzbarsky-apple

src/darwin/Framework/CHIP/MTRDeviceController.mm

@@ -385,8 +385,8 @@ - (void)_notifyDelegatesOfSuspendState
 {
     BOOL isSuspended = [self isSuspended];
     [self _callDelegatesWithBlock:^(id<MTRDeviceControllerDelegate> delegate) {
-        if ([delegate respondsToSelector:@selector(controller:isSuspended:)]) {
-            [delegate controller:self isSuspended:isSuspended];
+        if ([delegate respondsToSelector:@selector(controller:suspendedChangedTo:)]) {
+            [delegate controller:self suspendedChangedTo:isSuspended];
         }
     } logString:__PRETTY_FUNCTION__];
 }

src/darwin/Framework/CHIP/MTRDeviceControllerDelegate.h

@@ -112,7 +112,7 @@ MTR_AVAILABLE(ios(16.4), macos(13.3), watchos(9.4), tvos(16.4))
  * the controller will be in the specified state.
  */
 - (void)controller:(MTRDeviceController *)controller
-       isSuspended:(BOOL)suspended MTR_NEWLY_AVAILABLE;
+    suspendedChangedTo:(BOOL)suspended MTR_NEWLY_AVAILABLE;
 @end
 
 typedef NS_ENUM(NSUInteger, MTRPairingStatus) {

src/darwin/Framework/CHIPTests/MTRPerControllerStorageTests.m

@@ -93,7 +93,7 @@ - (id)initWithExpectation:(XCTestExpectation *)expectation expectedSuspensionSta
 }
 
 - (void)controller:(MTRDeviceController *)controller
-       isSuspended:(BOOL)suspended
+    suspendedChangedTo:(BOOL)suspended
 {
     XCTAssertEqual(suspended, self.expectedSuspensionState);
     [self.expectation fulfill];