Defer importing matplotlib

[akx]

Description

The Gradio features that actually require matplotlib are few and far between, and most matplotlib importing is already deferred.

This moves the rest.

[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
🦄	Changes	detected!	Details

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
gradio	minor

With the following changelog entry.

Defer importing matplotlib

⚠️ The changeset file for this pull request has been modified manually, so the changeset generation bot has been disabled. To go back into automatic mode, delete the changeset file.

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[akx]

I unfortunately can't tell if the test failures are legitimate, or if it's just the test suite being broken since I'm an external contributor and secrets are missing.

[abidlabs]

We’ll take a look thanks @akx!

[abidlabs]

LGTM! Thanks again @akx