ios: fix isLowerPowerModeEnabled deadlock crash

[Augustyniak]

iOS 15.x (I think up to 15.2) crashes due to a deadlock when the following situation occurs:

1. We access ProcessInfo.processInfo.isLowPowerModeEnabled
2. ProcessInfo posts Notification.Name.NSProcessInfoPowerStateDidChange notification in a synchronous way from within isLowePowerModeEnabled getter.
3. We access ProcessInfo.processInfo.isLowPowerModeEnabled from within Notification.Name.NSProcessInfoPowerStateDidChange notification.

The issue is caused by a bug in iOS 15 (which was fixed in later releases), so there is no perfect solution for this. My approach minimizes the risk of a crash by reducing the number of times we access ProcessInfo.processInfo.isLowPowerModeEnabled by over 99%. In practice, this should resolve the issue that our customers experienced.

One thing to note: I confirmed that this crash does not always occur on the first access of the ProcessInfo.processInfo.isLowPowerModeEnabled property.

Fixes BIT-4031

Stacktrace:

Crashed: io.bitdrift.capture.io.ResourceUtilizationTarget
0  libsystem_platform.dylib       0x60b8 _os_unfair_lock_recursive_abort + 36
1  libsystem_platform.dylib       0xa10 _os_unfair_lock_lock_slow + 304
2  Foundation                     0x28cf0 -[NSProcessInfo(NSProcessInfoHardwareState) isLowPowerModeEnabled] + 68
3  iCabbiDriver                   0xd5c628 DeviceStateListener.didReceiveNotification(_:) + 3725020
4  iCabbiDriver                   0xd5c1d4 closure #1 in closure #1 in closure #1 in DeviceStateListener.start() + 3723912
5  iCabbiDriver                   0x7104a4 thunk for @escaping @callee_guaranteed @Sendable (@in_guaranteed Notification) -> () + 4337403044 (<compiler-generated>:4337403044)
6  Foundation                     0x34b80 -[__NSObserver _doit:] + 348
7  CoreFoundation                 0x2aed8 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 28
8  CoreFoundation                 0xc6b8c ___CFXRegistrationPost_block_invoke + 52
9  CoreFoundation                 0x99f44 _CFXRegistrationPost + 456
10 CoreFoundation                 0x40d44 _CFXNotificationPost + 716
11 Foundation                     0x1a628 -[NSNotificationCenter postNotificationName:object:userInfo:] + 96
12 Foundation                     0x933e4 NSProcessInfoNotifyPowerState + 188
13 Foundation                     0x28d28 -[NSProcessInfo(NSProcessInfoHardwareState) isLowPowerModeEnabled] + 124
14 iCabbiDriver                   0xd61d88 LowPowerStateProvider.makeSnapshot() + 3747388
15 iCabbiDriver                   0xd61dc4 protocol witness for ResourceSnapshotProvider.makeSnapshot() in conformance LowPowerStateProvider + 3747448
16 iCabbiDriver                   0xd5fed4 closure #1 in ResourceUtilizationTarget.tick() + 3739528
17 iCabbiDriver                   0x404db8 thunk for @escaping @callee_guaranteed @Sendable () -> () + 4334210488 (<compiler-generated>:4334210488)
18 libdispatch.dylib              0x2914 _dispatch_call_block_and_release + 32
19 libdispatch.dylib              0x4660 _dispatch_client_callout + 20
20 libdispatch.dylib              0xbde4 _dispatch_lane_serial_drain + 672
21 libdispatch.dylib              0xc98c _dispatch_lane_invoke + 444
22 libdispatch.dylib              0xbcbc _dispatch_lane_serial_drain + 376
23 libdispatch.dylib              0xc98c _dispatch_lane_invoke + 444
24 libdispatch.dylib              0x171a8 _dispatch_workloop_worker_thread + 656
25 libsystem_pthread.dylib        0x10f4 _pthread_wqthread + 288
26 libsystem_pthread.dylib        0xe94 start_wqthread + 8