* make polls anonymous
Introduce a `PollBlindVote` DB table that tracks when a user votes in a poll,
but does not track which choice they made.
Alter the `PollVote` DB table to remove the `userId` column, meaning `PollVote`
now tracks poll votes anonymously - it captures votes per poll option,
but does not track which user submitted the vote.
Update the `poll_vote` DB function to work with both tables now.
Update the `item.poll` resolver to calculate `meVoted` based on the `PollBlindVote`
table instead of `PollVote`.
* remove `meVoted` on `PollOption`s
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Co-authored-by: Keyan <34140557+huumn@users.noreply.github.com>
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