FEAT: cbrt ufunc implementation

[SwayamInSync]

Copilot Summary

This pull request adds support for the cube root (cbrt) function to the quad-precision type, including its implementation, integration with NumPy ufuncs, release documentation, and comprehensive tests to ensure correctness and accuracy. The changes ensure that np.cbrt works seamlessly for quad-precision numbers, handling edge cases and special values.

Quad-precision cube root (cbrt) support:

• Implemented the quad_cbrt function in ops.hpp, handling special cases (NaN, zero, infinity, negative values) and computing the cube root using quad-precision arithmetic.
• Added the ld_cbrt function for long double cube root support in ops.hpp.

NumPy integration:

• Registered the new cbrt ufunc for both quad and long double types in umath/unary_ops.cpp, enabling its use via np.cbrt.

Documentation and release tracking:

• Updated release_tracker.md to indicate that cbrt is now supported for both quad and long double types.

Testing and validation:

• Added comprehensive tests for cbrt in test_quaddtype.py, covering perfect cubes, edge cases, special values, and accuracy checks for both positive and negative inputs.

[juntyr]

LGTM

[SwayamInSync]

merging this in!