feat: allow pg_stat_statements as query source in ci

[Xetera]

Previously we were forcing users to supply a LOG_PATH which is not really convenient. This puts things more in-line with the usual execution by introducing a RecentQuerySource interface classes can implement to provide an array of queries. With pgbadger that's by reading logs. With the regular PgConnector that's by querying PSS.

This change makes LOG_PATH optional.

[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.}