Add window states API #6991

Job	Run time
Pre-commit checks / Pre-commit Checks	37s
Check towncrier / Towncrier Checks	32s
Package Toga (android) / Create Python Package	16s
Package Toga (cocoa) / Create Python Package	26s
Package Toga (core) / Create Python Package	24s
Package Toga (demo) / Create Python Package	25s
Package Toga (dummy) / Create Python Package	23s
Package Toga (gtk) / Create Python Package	23s
Package Toga (iOS) / Create Python Package	16s
Package Toga (textual) / Create Python Package	20s
Package Toga (toga) / Create Python Package	18s
Package Toga (web) / Create Python Package	16s
Package Toga (winforms) / Create Python Package	15s
Test core (macos-latest, 3.9)	49s
Test core (macos-latest, 3.10)	43s
Test core (macos-latest, 3.11)	50s
Test core (macos-latest, 3.12)	49s
Test core (macos-latest, 3.13)	1m 11s
Test core (ubuntu-latest, 3.9)	56s
Test core (ubuntu-latest, 3.10)	52s
Test core (ubuntu-latest, 3.11)	48s
Test core (ubuntu-latest, 3.12)	1m 16s
Test core (ubuntu-latest, 3.13)	1m 24s
Test core (windows-latest, 3.9)	1m 40s
Test core (windows-latest, 3.10)	1m 39s
Test core (windows-latest, 3.11)	1m 36s
Test core (windows-latest, 3.12)	1m 43s
Test core (windows-latest, 3.13)	2m 33s
Coverage	29s
Testbed (macOS-x86_64)	11m 26s
Testbed (macOS-arm64)	8m 39s
Testbed (windows)	5m 31s
Testbed (linux-x11)	4m 59s
Testbed (linux-wayland)	5m 25s
Testbed (android)	8m 35s
Testbed (iOS)	12m 13s
Testbed (textual-linux)	57s
Testbed (textual-macOS)	59s
Testbed (textual-windows)	1m 58s
	1h 24m 51s

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