SDL: Add Suspend/Resume handlers for GDK #754

Job	Run time
FreeBSD	1m 13s
iOS/tvOS SDL3 (iOS, iphoneos, arm64)	47s
Rocky Linux MinGW	1m 19s
Rocky Linux	1m 59s
iOS/tvOS SDL3 (iOS, iphonesimulator, x86_64;arm64)	59s
Rocky Linux MinGW SDL3	1m 2s
iOS/tvOS SDL3 (tvOS, appletvos, arm64)	45s
Debian Linux PPC	1m 50s
iOS/tvOS SDL3 (tvOS, appletvsimulator, x86_64;arm64)	59s
Debian Linux PPC SDL3	1m 3s
Rocky Linux SDL3	1m 29s
macOS (Universal) SDL3	1m 13s
macOS (x86_64)	36s
Windows (MSVC)	51s
	16m 5s

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