refactor: organize the import and export of SparseModel

[honsunrise]

Hi @Anush008,

Additionally, I'm not quite clear on your thoughts. Perhaps we could move the RerankerModelInfo from crate::models::reranking to crate::models::model_info.
If you think this aligns with your design, then I can add a commit into this PR or open a new PR.

[Anush008]

Hey @honsunrise. Thanks for the contribution.

Additionally, I'm not quite clear on your thoughts. Perhaps we could move the RerankerModelInfo from crate::models::reranking to crate::models::model_info.
If you think this aligns with your design, then I can add a commit into this PR or open a new PR.

Fine by me.

[Anush008]

Hey @honsunrise. Thank you.
I see there have been multiple changes, which could potentially be breaking(We can't do that)
Could you please describe your changes?

[honsunrise]

Hey @honsunrise. Thank you. I see there have been multiple changes, which could potentially be breaking(We can't do that) Could you please describe your changes?

Hey @Anush008. Thank for your review.

Yes, There has two breaking changes:

1. Added the ModelEmbeddingDim trait for models that have a fixed output dimension. So if we need to obtain the model's output dimension, the following changes should be made: change model_info.dim to model_info.dim()
2. Due to changes in features made in hf-hub 0.4, the following adjustments have been made accordingly: the online feature has been changed to hf-hub-native-tls and hf-hub-rustls-tls

For the first breaking change, if we want to unify ModelInfo to achieve a consistent and clean API, this might be the best approach I can think of.
For the second change, perhaps we can add online = ["hf-hub-native-tls"] to fix it, if you think it's absolutely necessary.

[Anush008]

We cannot have breaking changes unless itss a major release though.

[honsunrise]

We cannot have breaking changes unless itss a major release though.

Can we consider this PR as part of a major release?

[honsunrise]

We cannot have breaking changes unless itss a major release though.

I rolled back all the breaking changes and moved them to a new PR.

[Anush008]

Can we consider this PR as part of a major release?
There isn't anything planned for a major release.

[Anush008]

Thank you for contributing @honsunrise. LGTM!

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