Support useCache option.

[shareable-vision]

Is your feature request related to a problem? Please describe

Nuxt Content module v1 provided the useCache option to allow the prerendering/caching behavior to be disabled during production.

This is highly desirable, if you want to provide dynamic content in production without rebuilding the application.

Describe the solution you'd like

Provide the useCache option in the configuration to determine caching behavior:

const useCache = Boolean(!nuxt.options.dev && options.useCache)

Additional context

See discussion #2206

[shareable-vision]

If dynamic content were supported in production, perhaps the API should change, because useCache would be misleading, obviously implying that there's no caching at all.

The default behavior is to write the cache into the build directory with storage 'fs' driver (with 'cache:content' and 'cache:content:parsed' prefixes).

Alternatively the 'memory' driver could be used in development or production —simply decoupling from the filesystem.

Perhaps something like buildCache, optimizeCache, or staticCache would be more appropriate than useCache, or alternatively (to express the opposite) liveContent or dynamicContent.

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