PyTree integration for the awkward and sympy(?) backend

[Saransh-cpp]

Describe the potential feature

Following #637, it would be nice to some day have the integration work with the Awkward and SymPy (?) backend.

Motivation

No response

Possible Implementation

https://github.com/scikit-hep/awkward/blob/main/src/awkward/_connect/jax/trees.py