lib: make SubtleCrypto.supports enumerable #4365

Job	Run time
Build slim tarball	5m 5s
x86_64-linux: with shared libraries	22m 22s
aarch64-linux: with shared libraries	18m 31s
aarch64-darwin: with shared libraries	18m 52s
x86_64-darwin: with shared libraries	39m 26s
	1h 44m 16s

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