Robustness testing and proofing for page storage and WAL.

[github-actions[bot]]

A battery of tests is going to be needed on this, to verify the ACIDity.

https://github.com/rdaum/moor/blob/47435a1442a1f5532c23944029e90982baa99bff/crates/db/src/rdb/paging/page_storage.rs#L15

// this program. If not, see <https://www.gnu.org/licenses/>.
//

// TODO: Robustness testing and proofing for page storage and WAL.
//   A battery of tests is going to be needed on this, to verify the ACIDity.

use std::collections::{HashMap, HashSet};