feat(gallery): Add 'Get Config' button for models (#6154)

* feat(gallery): Add 'Get Config' button for models

This commit introduces a 'Get Config' button to the model gallery UI. This allows users to download and save the configuration file for a model without installing the model's weights.

Key changes:
- Added a getConfigButton element and integrated it into the gallery card.
- Created a new API endpoint /browse/config/model/:id to handle fetching and saving the model configuration.
- Refactored the InstallModel function to allow saving only the configuration file without downloading model weights.
- Added a ToYAML method on ModelConfig for serialization.
- Fixed button spacing in the gallery UI.

Signed-off-by: Matt Cowger <matt.cowger@sigmacomputing.com>

* Update for reviewer comments

Signed-off-by: Matt Cowger <matt.cowger@sigmacomputing.com>

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Signed-off-by: Matt Cowger <matt.cowger@sigmacomputing.com>