lib: expose `v8.startupSnapshot` functions on `globalThis` #6412

Job	Run time
Build slim tarball	1m 5s
aarch64-linux: Cache V8 build	23s
x86_64-darwin: with shared libraries	34m 5s
x86_64-linux: with shared libraries	25m 35s
aarch64-darwin: with shared libraries	23m 52s
aarch64-linux: with shared openssl-1.1.1w	22m 18s
aarch64-linux: with shared openssl-3.0.19	23m 27s
aarch64-linux: with shared openssl-4.0.0	23m 14s
aarch64-linux: with shared openssl-3.5.5	22m 13s
aarch64-linux: with shared openssl-3.6.1	22m 53s
	3h 19m 5s

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