Add microsoft/phi-1_5 qlora example

[jambayk]

Describe your changes

Add qlora finetuning example for phi model.

Updated the output dirs for open_llama examples to make them follow the same pattern.
Added missing link to LoRA paper.

Checklist before requesting a review

• Add unit tests for this change.
• Make sure all tests can pass.
• Update documents if necessary.
• Format your code by running pre-commit run --all-files
• Is this a user-facing change? If yes, give a description of this change to be included in the release notes.

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