Add transactions and support recovery from WAL#17
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This changes the header significantly; reserving 64 bytes at the start of all `Page`s in the file. The header is now different different on the type of `Page`: - Meta Page: The first page of any storage file. Contains information about the storage file (global variabls and such) - Leaf & Internal Page: These are going to be B+ or Blink Tree Nodes
This splits out the table and meta page handling from the `Page`, leaving it as simple as possible. This way the accessed API is actually controlled and you don't have to worry about the layout or accessing something that doesn't exist for that page.
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The `MutationScope` is for primarily tracking what exactly changed in a page. It provides the same API as a normal page allowing it to be easily substituted in place of a real page, report/inspect the change and the re-apply.
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