feat(si-pkg): allow generation of a spec without any unique info

[sprutton1]

• makes it so a PkgSpec can anonymize itself, i.e. set all unique info (dates, ids, etc.) to an empty or known value
• adds a command to hoist to let it transform specs into anonymous specs

these anonymous specs will be used for

• generating hashes that don't include ids that can be stored in the module index to make comparison of specs more accurate
• generating diffs that ignore redundant information

buck2 run //bin/hoist:hoist -- anonymize-specs -t ./bin/clover/si-specs -o ./test

[github-actions]

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[vbustamante]

Got a question there, maybe a typo?