Add warnings if multiple JSX renderers are used

[louisescher]

Changes

• Adds warnings to all common JSX renderer integrations if multiple known JSX renderer integrations are used at the same time. This is meant to combat the common mistake of not setting the include or exclude options when using multiple UI frameworks together.

Testing

As this is just a warning printed to console, no tests have been added.

Docs

As this is just a warning printed to console, no docs have been added.

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[ematipico]

Have you considered having this logic in core? The integrations shouldn't be aware of each other, instead the core needs to know

[florian-lefebvre]

I think the issue is core doesn't have access to the integrations options so it can't check include/exclude

[louisescher]

@florian-lefebvre is correct. Core would've been the better solution but it can't see what options are passed

[ematipico]

I don't see any issue at all. We could expose a utility from astro/config called getKnownJsxRenderers which does what this PR implemented.

[louisescher]

@ematipico Is that just for the known renderers so that the integration can throw the warning? I'd be happy to implement it there