[fix] Refactor AimCallback to BaseCallback in huggingface tracker

[prince14322]

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[alberttorosyan]

Hey @prince14322! Thank you for fixing this issue and contributing to Aim 🙌
We moved the code-base for this version to a separate repo aimos. The base branch is now pointing to main-bckp which is left here just for the sake of maintaining the commit history.
Would you mind closing this PR and opening one on aimos repo? As GitHub doesn't provide ability to change the base branch to another repo.