lib: add `internal/primordials_staging` module #7033

Job	Run time
Build slim tarball	58s
aarch64-linux: Cache V8 build	24s
x86_64-darwin: with shared libraries	38m 59s
aarch64-darwin: with shared libraries	24m 21s
x86_64-linux: with shared libraries	27m 3s
aarch64-linux: with shared openssl-4.0.0	23m 3s
aarch64-linux: with shared openssl-1.1.1w	22m 49s
aarch64-linux: with shared openssl-3.6.1	22m 55s
aarch64-linux: with shared openssl-3.5.5	23m 20s
aarch64-linux: with shared boringssl-0.20260413.0	23m 19s
aarch64-linux: with shared openssl-3.0.19	23m 7s
	3h 50m 18s

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