src: decouple KeyObject and CryptoKey and move CryptoKey to src #6310

Job	Run time
Build slim tarball	1m 6s
aarch64-linux: Cache V8 build	19s
aarch64-darwin: with shared libraries	28m 30s
x86_64-darwin: with shared libraries	41m 15s
x86_64-linux: with shared libraries	32m 57s
aarch64-linux: with shared openssl-1.1.1w	25m 55s
aarch64-linux: with shared openssl-3.6.1	26m 42s
aarch64-linux: with shared openssl-3.5.5	25m 52s
aarch64-linux: with shared openssl-4.0.0	26m 5s
aarch64-linux: with shared openssl-3.0.19	25m 36s
	3h 54m 17s

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