loader: implement package maps #6199

Job	Run time
collect-openssl-versions	8s
Build slim tarball	1m 23s
aarch64-darwin: with shared libraries	28m 39s
x86_64-linux: with shared libraries	32m 10s
x86_64-darwin: with shared libraries	47m 27s
aarch64-linux: Cache V8 build	26s
aarch64-linux: with shared openssl_4_0 (4.0.0)	26m 10s
aarch64-linux: with shared openssl_1_1 (1.1.1w)	24m 51s
aarch64-linux: with shared openssl_3 (3.0.19)	26m 11s
aarch64-linux: with shared openssl_3_5 (3.5.5)	25m 52s
aarch64-linux: with shared openssl_3_6 (3.6.1)	25m 50s
	3h 59m 7s

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