Added logaddexp2 method to the PyTorch frontend

[he11owthere]

closes: #21803

[github-actions]

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[he11owthere]

@DecFox Please add 'bfloat16' in the with_unsupported_dtypes decorator before running the tests until the issue with ivy.Array.repr method has been fixed as mentioned by Ved in #21447. Thank you! 🙂

[ivy-seed]

This PR has been labelled as stale because it has been inactive for more than 7 days. If you would like to continue working on this PR, then please add another comment or this PR will be closed in 7 days.

[he11owthere]

This PR has been labelled as stale because it has been inactive for more than 7 days. If you would like to continue working on this PR, then please add another comment or this PR will be closed in 7 days.

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