Adding new zero-shot examples

[SangbumChoi]

What does this PR do?

Fixes #32459

Following two PR should be merged before merging this example!
#31828
#31964

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[qubvel]

Hi @SangbumChoi, thanks for iterating! Great work!

I left a comment regarding Trainer, also don't know if it deserves a separate PR. Overall looks very good to me, but I didn't do an in-depth view yet (let's wait for loss PR to be merged). For these examples the tests have to be added and information in README (see files in this directory). Also, feel free to add resources to docs of Grounding DINO. Btw, did you try to fine-tune OwlV2?

[SangbumChoi]

@qubvel Sounds good. I can wait until the loss PR get merged.

Btw, did you try to fine-tune OwlV2?

I didn't aware that we can fine-tune OwlV2, let me see while waiting loss PR!

[SangbumChoi]

Hi @qubvel It is now ready to review this new example. For the CI error it says unauthorized I'm not sure how to handle this so it would be appreciated to let me know how to fix this.

[SangbumChoi]