## Beef
`defragment_page_fast()` incorrectly didn't use the version of
read/write methods on `PageContent` that does NOT add the 100 byte
database header into the requested byte offset.
this resulted in defragment of page 1 in reading 2nd/3rd freeblocks
from the wrong offset and reading/writing freeblock sizes and cell
offsets to the wrong location.
## Testing
Adds fuzz test for CREATE TABLE / DROP TABLE / ALTER TABLE, which I was
able to reproduce this with.
Closes#2491
3f181c9145