Adds a readonly (static) Trackio mode (includes a BREAKING change: trackio.sync() will now output readonly Spaces by default)

[abidlabs]

Following up from #450, Trackio can now deploy as a static Space reading and displaying from a HF dataset. This is useful to display to display dashboards after training is complete, e.g. in our Trainer/Transformers/TRL integrations, cc @qgallouedec

In fact, I've made the default behavior of trackio.sync() to create a static space, so that we do not need to update our integrations in these libraries. The previous behavior can be recovered by setting read_only=False.

Example: https://huggingface.co/spaces/abidlabs/sync-demo-860574-rtkyENK1ODc

Also a variety of fixes for gaps in the refactor in #450

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This Pull Request includes changes to the following packages.

Package	Version
trackio	minor

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• Adds a readonly (static) Trackio mode (includes a BREAKING change: trackio.sync() will now output readonly Spaces by default)

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[abidlabs]

I spent some more time on this, and actually we will need to make changes in transformers/trl/Trainer to support the new static deployment. So I'm going to change this PR to be non-breaking. To deploy as a static space, you will need to sync(sdk="static") explicitly, otherwise the old behavior will be preserved.