lstsq function on paddle

[Risi-droid]

Hi there!
I will be working on implementing the lstq linear algebra function in the Paddle front end.

Based on the task list, it looks like this function does not yet have a RawOps implementation, so I will create a new implementation in the linear_algebra.py file. I will also ensure that any additional parameters are included and properly documented.

I will keep everyone updated on my progress and will create a pull request as soon as I have a partial or full solution. If anyone has any questions or suggestions, please feel free to reach out to me.

Looking forward to contributing to the project!