* zebra-chain changes from the subtree-boundaries branch
```sh
git checkout -b subtree-boundaries-zebra-chain main
git checkout origin/subtree-boundaries zebra-chain
git commit
```
* Temporarily populate new subtree fields with None - for revert
This temporary commit needs to be reverted in the next PR.
* Applies suggestions from code review
* removes from_repr_unchecked methods
* simplifies loop
* adds subtrees to zebra-state
* uses split_at, from_repr, & updates state-db-upgrades.md
* Update book/src/dev/state-db-upgrades.md
Co-authored-by: teor <teor@riseup.net>
* renames partial_subtree to subtree_data
* tests that subtree serialization format
* adds raw data format serialization round-trip test
* decrements minor version and skips inserting subtrees in db
---------
Co-authored-by: teor <teor@riseup.net>
* Move the state format into a new doc
* Add upgrade instructions
* Link to the format upgrade docs from the upgrade code
* Fix typo
Co-authored-by: Marek <mail@marek.onl>
---------
Co-authored-by: Marek <mail@marek.onl>
Arya
teor