FEAT: conj and conjugate ufunc implementation

[SwayamInSync]

Copilot Summary

This pull request adds support for the conjugate and conj unary operations for quad and long double types, treating them as no-ops since these types represent real numbers. It also updates documentation to reflect this new support.

New unary operations support

• Added quad_conjugate and ld_conjugate functions to ops.hpp, implementing conjugate as a no-op for real numbers. [1] [2]
• Registered the conjugate unary operation in init_quad_unary_ops and documented that conj is an alias, so no separate registration is needed.

Documentation update

• Updated release_tracker.md to mark conj and conjugate as supported for both quad and long double types.

[juntyr]

Could this PR have a very basic no-op test (what do we do for np.positive)?

[SwayamInSync]

Could this PR have a very basic no-op test (what do we do for np.positive)?

for np.positive and others we just compare against the numpy's answer on float64 with some relative tolerance

[SwayamInSync]

One reason I didn't add the tests because this covers only the real part of conjugate functionality i.e only returning the value back like identity.

[juntyr]

I still think it would be good to test this, otherwise one could implement the function by returning pi

[SwayamInSync]

Coool tests are added, lets merge this as well