loader: implement package maps #7743

Job	Run time
Build slim tarball	1m 20s
aarch64-linux: Cache V8 build	25s
aarch64-darwin: with shared libraries	30m 26s
x86_64-darwin: with shared libraries	40m 49s
x86_64-linux: with shared libraries	30m 35s
aarch64-linux: with shared openssl-3.5.6	26m 44s
aarch64-linux: with shared openssl-4.0.0	25m 57s
aarch64-linux: with shared openssl-1.1.1w	25m 45s
aarch64-linux: with shared boringssl-0.20260508.0	26m 44s
aarch64-linux: with shared openssl-3.6.2	26m 51s
aarch64-linux: with shared openssl-3.0.20	27m 3s
	4h 22m 39s

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