New output-restore-list option for capturing a list of all products restored

[newhoggy]

Example:

$ cabal-cache sync-to-archive --archive-uri moo
...
$ cabal-cache sync-from-archive --archive-uri moo --store-path foo --output-restore-list list.txt
$ head list.txt
moo/v2/ghc-8.6.5/bs-rphns-0.8.3-275d6078.tar.gz
moo/v2/ghc-8.6.5/bsmnt-0.0.11-9bd23486.tar.gz
moo/v2/ghc-8.6.5/cll-stck-0.2.0-b051a226.tar.gz
moo/v2/ghc-8.6.5/crl-0.5.8.1-c515803e.tar.gz
moo/v2/ghc-8.6.5/dlst-0.8.0.8-4606911b.tar.gz
moo/v2/ghc-8.6.5/dt-dflt-clss-0.1.2.0-26b86bca.tar.gz
moo/v2/ghc-8.6.5/hrglss-0.2.12-0a114aa7.tar.gz
moo/v2/ghc-8.6.5/mnd-lps-0.4.3-7f5c557a.tar.gz
moo/v2/ghc-8.6.5/ndxd-prfnctrs-0.1-7f25585b.tar.gz
moo/v2/ghc-8.6.5/ntgr-lgrthms-1.0.3-9cf93210.tar.gz