Added ActivityIndicator implementation for iOS #6694

Job	Run time
Check towncrier / Towncrier Checks	31s
Pre-commit checks / Pre-commit Checks	43s
Package Toga (android) / Create Python Package	25s
Package Toga (core) / Create Python Package	25s
Package Toga (cocoa) / Create Python Package	24s
Package Toga (gtk) / Create Python Package	24s
Package Toga (demo) / Create Python Package	15s
Package Toga (dummy) / Create Python Package	18s
Package Toga (iOS) / Create Python Package	23s
Package Toga (textual) / Create Python Package	22s
Package Toga (toga) / Create Python Package	27s
Package Toga (web) / Create Python Package	23s
Package Toga (winforms) / Create Python Package	15s
Test core (macos-12, 3.8)	1m 9s
Test core (macos-12, 3.12)	1m 20s
Test core (macos-12, 3.13-dev)	1m 58s
Test core (macos-14, 3.12)	44s
Test core (macos-14, 3.13-dev)	1m 12s
Test core (ubuntu-latest, 3.8)	55s
Test core (ubuntu-latest, 3.12)	1m 5s
Test core (ubuntu-latest, 3.13-dev)	1m 6s
Test core (windows-latest, 3.8)	1m 46s
Test core (windows-latest, 3.12)	1m 33s
Test core (ubuntu-latest, 3.9, false)	56s
Test core (ubuntu-latest, 3.10, false)	47s
Test core (ubuntu-latest, 3.11, false)	52s
Coverage	34s
Testbed (macOS-x86_64)	4m 43s
Testbed (macOS-arm64)	3m 15s
Testbed (windows)	5m 55s
Testbed (linux-x11)	2m 54s
Testbed (linux-wayland)	3m 33s
Testbed (android)	7m 41s
Testbed (iOS)	5m 46s
	54m 59s

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