Move theming to its own package

[plouc]

@nivo/core contains a bit of everything, and it can lead to circular dependencies (it's the case with @nivo/tooltip for example), so I decided to move it to its own package.

The added benefit is that now this part will be in TypeScript, as @nivo/core is unfortunately still not.

Extra features:

• We can now define a text outline for most text elements via outlineWidth, outlineColor and outlineOpacity via the theme object.

This introduces some breaking changes:

• When implementing custom layers/components, you might use useTheme, previously imported from @nivo/core, now it's defined in @nivo/theming
• The TypeScript definition of a theme changed a little bit, please see the new type in the @nivo/theming package.

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Name	Status	Preview	Comments	Updated (UTC)
nivo	❌ Failed (Inspect)			May 14, 2023 1:38am

[pcorpet]

@plouc Any update on this one? It would be useful to get the d3-color vulnerability fix released.

[junaidNadeem]

@plouc d3-color vulnerability has posed security challenges for nivo's usage.

Recent upgrade of nivo hasn't resolved it because the version upgrade has brought ESM & CJS modules conflict. Any information about the release date would be greatly appreciated.

[stale]

This pull request has been automatically marked as stale. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. We are sorry that we haven't been able to prioritize reviewing it yet. Your contribution is very much appreciated.