Added abs function for paddlepaddle frontend

[yashsandansing]

close #15976

[yashsandansing]

Hi @Ishticode could you please review this PR?
There seems to be just 1 fail which ig is common to all paddlepaddle tasks

[Ishticode]

@yashsandansing Thank you very much for the PR. I think this looks good. Should be able to merge when I run the tests. But could u resolve conflicts and tag me. Let me know if you need any help or have any questions. Thank you very much. 🙂

[yashsandansing]

Hey @Ishticode I have resolved the conflicts and the PR is ready to be reviewed again

[Ishticode]

Ready to merge. We should be careful not to remove decorators from other functions. Ive added back the decorators for the function multiply.
Thank you very much for the contribution @yashsandansing
🙂

[yashsandansing]

Thanks for the merge @Ishticode
I did try to make sure that I did not remove anything while committing but I guess I must have overlooked it.
Thanks for pointing it out. I'll make sure it won't happen again. :)