feat: Implementation of inv function in Paddle frontend.

[HPatto]

PR Description

Implementation of the inv function in Paddle frontend. Tests pass locally, although I believe namespace choice in the initial ToDo List should be changed. Current version of Paddle puts the inv function in the "paddle.linalg" namespace.

Related Issue

Closes #26522

Checklist

• [y] Did you add a function?
• [y] Did you add the tests?
• [y] Did you run your tests and are your tests passing?
• [y] Did pre-commit not fail on any check?
• [y] Did you follow the steps we provided?

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[HPatto]

I have some general thoughts/questions on the submission.

1. The namespace of the implemented function (paddle.linalg.inv) is different to the suggestion inside the ToDo List Issue (paddle.math.inv). This was done for two reasons: (1), it matches the current Paddle documentation and (2), the tests would throw a "Key Error" if the frontend function was not in the linalg namespace - I think it couldn't determine the ground truth.

2. The control of acceptable data-types is partially handled within the function decorator, and partially within the test definition. This mimics the implementation of jax.numpy.inv, but I'm not sure if it's best practice.

[hmahmood24]

The linked issue is for adding paddle.inverse (https://github.com/PaddlePaddle/Paddle/blob/release/2.2/python/paddle/tensor/math.py#L1167) and not paddle.linalg.inv even though both functions have the same functionality. Can you please move your function and the test to the correct files? Thanks :)

[HPatto]

Hey @hmahmood24,

Let me know if there's anything else to fix, and I'll get on it.

[hmahmood24]

Changes look good to me. Thanks so much for the contribution! @HPatto 🚀