privacy-scaling-explorations / zk-kit.rust / 10704018133

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chore(imt): Add methods to retrieve nodes and zeroes in IMT (#50)

## Description

The code changes introduce two new getter methods, `nodes()` and
`zeroes()`, to the IMT struct. These methods are necessary for accessing
the internal structure of the IMT, particularly for cases where the
intermediate tree states and padding values are required.

The `nodes()` method provides access to the current state of the tree's
nodes, which is useful for debugging and verifying the structure of the
Merkle tree during construction.

The `zeroes()` method allows retrieval of the precomputed zero nodes,
which are critical for correctly padding incomplete levels when
combining batch roots in parallel Merkle tree construction.

## Other Information 
I needed access to the zeroes without re-generating them, and the
intermediate nodes are useful for debugging during parallelization.

## Checklist

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] My changes generate no new warnings
- [x] New and existing unit tests pass locally with my changes

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