Closes #2057 , #1041

If we keep the current design, we are also closing
#1822

Supersedes #1764

This PR implements support for an additional DB key representation. The
different key layout sorts the entries by height instead of
lexicographically as in the current version of Comet.

When starting this work, we hoped that the new layout would
significantly outperform the current layout. As we do not have
sufficient real world evidence for this, this PR introduces a DB key
layout interface that would allow Comet to easily integrate a more
preferential key representation without major breaking changes.

The layout using ordercode is introduced as experimental, allowing users
to easily experiment with this.

This layout was thoroughly tested as part of #1044 and all results will
be in a report closing the mentioned PR.

Locally tested:
- Empty stores get initialized with v2
- Existing stores without a version key get initialized to v1 and the
key is set
- When a nodes' stores are deleted and we boot it up again that node
uses v2 while the rest of the nodes use v1
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---

#### PR checklist

- [x] Tests written/updated
- [x] Changelog entry added in `.changelog` (we use
[unclog](https://github.com/informalsystems/unclog) to manage our
changelog)
- [ ] Updated relevant documentation (`docs/` or `spec/`) and code
comments
- [x] Title follows the [Conventional
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---------

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
(cherry picked from commit 55638e8)