loader: implement package maps #7740

Job	Run time
Build slim tarball	1m 22s
x86_64-darwin: with shared libraries	47m 31s
aarch64-darwin: with shared libraries	27m 32s
aarch64-linux: Cache V8 build	23s
x86_64-linux: with shared libraries	31m 7s
aarch64-linux: with shared openssl-3.5.6	26m 47s
aarch64-linux: with shared openssl-1.1.1w	25m 22s
aarch64-linux: with shared boringssl-0.20260508.0	25m 44s
aarch64-linux: with shared openssl-3.6.2	27m 7s
aarch64-linux: with shared openssl-4.0.0	25m 55s
aarch64-linux: with shared openssl-3.0.20	26m 54s
	4h 25m 44s

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