feat(core): add Manager::add_capability, closes #8799 #9331

Job	Run time
test (x86_64-pc-windows-msvc, windows-latest, 1.70.0, false, test, --no-default-features, no-defa...	4m 53s
test (x86_64-pc-windows-msvc, windows-latest, 1.70.0, false, test, --all-features, all)	5m 9s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.70.0, false, test, --no-default-features, no-def...	5m 12s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.70.0, false, test, --all-features, all)	7m 52s
test (aarch64-apple-darwin, macos-14, 1.70.0, false, test, --no-default-features, no-default)	2m 12s
test (aarch64-apple-darwin, macos-14, 1.70.0, false, test, --all-features, all)	2m 12s
test (aarch64-apple-ios, macos-latest, 1.70.0, false, build, --no-default-features, no-default)	2m 47s
test (aarch64-apple-ios, macos-latest, 1.70.0, false, build, --all-features, all)	1m 49s
test (aarch64-linux-android, ubuntu-latest, 1.70.0, true, build, --no-default-features, no-default)	1m 50s
test (aarch64-linux-android, ubuntu-latest, 1.70.0, true, build, --all-features, all)	1m 18s
	35m 14s

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