Optimize the speed of _compute_3body implementation

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Walkthrough

The _compute_3body function in src/matgl/graph/compute.py has been significantly optimized for performance. Key improvements include the efficient counting of bonds per atom using np.bincount and streamlined generation of triple_bond_indices with numpy operations. The management of three_body_id and max_three_body_id has also been revised for efficiency. Additionally, the return value has been simplified to return only l_g.

Changes

File	Change Summary
`src/matgl/graph/compute.py`	Optimized `_compute_3body` function, removed unnecessary parameters, streamlined return type.

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant Compute as compute.py

    Caller->>Compute: _compute_3body(g)
    Compute->>Compute: Count bonds per atom using np.bincount
    Compute->>Compute: Generate triple_bond_indices via numpy operations
    Compute->>Compute: Handle three_body_id and max_three_body_id efficiently
    Compute-->>Caller: Return l_g

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materialsvirtuallab / matgl