[PostgresPuzzleList 3/N] Add solved stats to new puzzle list

[ewmson]

Adds in the solved count for the puzzle list.

This makes a denormalized column on puzzles to get the number of solves and logs to it whenever someone does a solve.

Depends on https://github.com/downforacross/downforacross.com/pull/151 so will also have those changes until that one is merged (let me know if there is a better way to have these broken up pull requests with dependencies).

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[stevenhao]

Created the table in staging and prod via

psql < create_puzzle_solves.sql
psql < add_times_solved_1_24_21.sql
ppsql < create_puzzle_solves.sql
ppsql < add_times_solved_1_24_21.sql
# ppsql: aliased to PGDATABASE="production" psql

after some changes to the ts, I was able to test this via devbackendprod. It's working!

[stevenhao]

Wrap-up:

This PR has been fully deployed to downforacross.com.

• users must use new puzzle list (localStorage.newPuzzleListEnabled = '1') to see solve count statistics
• all solves are logged to db regardless of the local flag

Thanks @ewmson for this contribution! This is huge!

[stevenhao]

https://github.com/downforacross/downforacross.com/commit/56b99f3a923dde428fca562b7cf3d72f794b916f fix here