refactor!(core): remove `Icon` enum and add `Image` type #9469

Job	Run time
test (x86_64-pc-windows-msvc, windows-latest, 1.70.0, false, test, --no-default-features, no-defa...	4m 20s
test (x86_64-pc-windows-msvc, windows-latest, 1.70.0, false, test, --all-features, all)	6m 3s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.70.0, false, test, --no-default-features, no-def...	5m 3s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.70.0, false, test, --all-features, all)	7m 17s
test (aarch64-apple-darwin, macos-14, 1.70.0, false, test, --no-default-features, no-default)	2m 16s
test (aarch64-apple-darwin, macos-14, 1.70.0, false, test, --all-features, all)	2m 22s
test (aarch64-apple-ios, macos-latest, 1.70.0, false, build, --no-default-features, no-default)	2m 16s
test (aarch64-apple-ios, macos-latest, 1.70.0, false, build, --all-features, all)	1m 48s
test (aarch64-linux-android, ubuntu-latest, 1.70.0, true, build, --no-default-features, no-default)	1m 56s
test (aarch64-linux-android, ubuntu-latest, 1.70.0, true, build, --all-features, all)	1m 20s
	34m 41s

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