feat: Modify v1 IAVL to work with pure-preimage queries

[i-norden]

• For https://github.com/polymerdao/roadmap/issues/25
• On-top of the v1.1.2 version we use in monomer

This updates to be able to use the v0/legacy node db key format with the v1 interface. No impact on v1 support, it is still the default mode of operation and operates exactly as before.

Additionally, as with v0, there were two other things that needed to be adjusted to support pure preimage queries

1. To lookup the root hash by version (block height), which is then used to retrieve the root node. We need to instead provide the roothash directly, a method is introduced for loading a tree in this manner. This will also require modification in the calling context of our FPP application logic.
2. To load the storage version value (a versioning of the database- not the block height- e.g. 1.1.0). We avoid this when working with a legacy tree.

Note that in our FPP we must also be sure to instantiate our mutable tree without a fastcache, as the fastcache uses non-preimage keys.

These changes do not affect the underlying DB layout so will be compatible with the normal usage in our non-FPP application logic (Polymerase).

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[dshiell]

not sure I understand everything fully, but don't want you to be blocked. maybe we can review during our 1:1