Analyze queries and look for missing indices

[juliusknorr]

Placeholder ticket to analyze the queries that the tables app builds for general browsing and especially for view filters to see if we lack any indices or need to optimize certain queries using https://github.com/nextcloud/profiler

Let's collect findings in this ticket:

• [ ] DELETE FROM oc_tables_row_cells_* WHERE row_id = ? (Code)
• [ ] table_id on oc_tables_views (https://github.com/nextcloud/tables/pull/1062)
• [ ] table_id on oc_tables_columns
• [ ] table_id on oc_tables_row_sleeves
• [ ] get Columns in one query instead of n (Code)
• [ ] Tables ownership index