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This PR adds the beginnings of [AUTOVACUUM](https://www.sqlite.org/lang_vacuum.html) to Limbo. It adds a feature flag called `omit_autovacuum` which is analogous to `SQLITE_OMIT_AUTOVACUUM`. It is off by default, same as SQLite. It introduces the concept of [pointer map pages](https://www.sqlite.org/ fileformat.html#pointer_map_or_ptrmap_pages) which are reverse index pages used to map pages to their parents. This is used to swap pages (when a table is deleted for instance) to keep root pages clustered at the beginning of the file. It's also used while creating a table to ensure that root pages are clustered at the beginning (although, this isn't completely implemented yet) Finally, it also adds a couple of missing instructions like `Int64` that are required for `PRAGMA` commands related to `auto_vacuum` settings <img width="1512" alt="Screenshot 2025-05-28 at 8 47 51 PM" src="https://github.com/user- attachments/assets/d52eb74f-5b79-4d52-9401-1bdc2dcc304d" /> Closes #1600