pack-objects: add third name hash version #2082

Job	Run time
config	4s
fuzz smoke test	35s
win+VS build	0s
static-analysis	3m 49s
linux32 (i386/ubuntu:focal)	1m 37s
linux-musl (alpine)	1m 30s
win build	4m 51s
pedantic (fedora)	1m 20s
documentation	3m 30s
win+VS test	0s
sparse	2m 28s
linux-asan-ubsan (ubuntu-latest)	28m 11s
linux-gcc (ubuntu-20.04)	1m 14s
linux-gcc-default (ubuntu-latest)	1m 9s
linux-leaks (ubuntu-latest)	1m 37s
linux-reftable (ubuntu-latest)	11m 11s
linux-reftable-leaks (ubuntu-latest)	44s
linux-sha256 (ubuntu-latest)	10m 45s
linux-TEST-vars (ubuntu-20.04)	1m 28s
osx-clang (macos-13)	29m 53s
osx-gcc (macos-13)	1m 13s
osx-reftable (macos-13)	29m 17s
win test	0s
	2h 16m 26s

Provide feedback