Update redb from 0.13.0 to 0.20.0

[raphjaph]

Still have to run some benchmarks.

[veryordinally]

Converting to draft until we resolve the performance issues.

[veryordinally]

Seeing somewhat of an improvement by setting 8 GiB cache like this:

        let database = Database::builder()
        .set_cache_size(8589934592)
        .create(&path)
        .unwrap();

Benchmarks in https://github.com/cberner/redb/issues/603

[veryordinally]

See also https://github.com/ordinals/ord/issues/2183

[raphjaph]

I updated to 1.0.1. It's the second stable release for redb

[raphjaph]

Waiting for https://github.com/cberner/redb/issues/626 to resolve.