feat: install pg_stat_statements automatically

[Xetera]

Adds functionality for explicitly installing pg_stat_statements. There's some concern here about not having the db be behind auth but in practice I don't think it's going to be an issue. This doesn't give the user control over the database or run any arbitrary commands

[github-actions]

Query Doctor Analysis

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2 queries analyzed

2 pre-existing issues

• SELECT "guests"."id", "guests"."session_id", "guests"."username", "guests"."avatar_path", "guests"."color", "guests"."side", "guests"."audio_recording_path", "guests"."audio_recording_public", "gue...
  index assets(event_id, inserted_at desc)
  cost 31,003,449 → 1,498 (100% reduction)
• SELECT * FROM guest_ip_addresses WHERE ip_address = '127.0.0.1';
  index guest_ip_addresses(ip_address)
  cost 154,402 → 8 (100% reduction)

_{Using assumed statistics (10000000 rows/table). For better results, sync production stats.}

[veksen]

I'm not going to block merge on this but I believe this should come with tests