Improve DX of creating custom Phoria Islands

[CMeeg]

• The existing PhoriaIslandTagHelper can be used to render any Phoria Island
• However downstream projects may want to create custom Tag Helpers or View Components that encapsulate the rendering of their specific Phoria Island components to make them feel more "integrated" with their project, consistent where they are used, ease maintenance, and to add strong typing for props
• PhoriaIslandTagHelper can be inherited from for this purpose, but its IOC dependencies and some of the internal rendering logic would need to also be setup each time in the derived class(es), which is not something that should be the responsibility of the consumer to do and get right each time
• A PhoriaIslandComponentFacory will be created to encapsulate the IOC dependencies and minimise the amount of code needed to create a custom Phoria Island Tag Helper or View Component
• The PhoriaIslandComponentFactory can then be used internally by PhoriaTagHelper, and by consumers
• Docs to be updated to show intended usage

[changeset-bot]

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Latest commit: 8e50db2

The changes in this PR will be included in the next version bump.

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phoria-dotnet	Patch

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