feat: add prismic provider

[lihbr]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Add Prismic provider~ cc @pi0

closes #150

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: feat: add prismic provider #269 (this PR))
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[lihbr]

Thanks for the review! Addressed your suggestions, wasn't aware of those new utilities on UFO. Looks better like that! Let me know if anything else~

[danielroe]

Something along the lines of:

Suggested change

	To use this provider you just need to specify an empty object at `prismic` key in Nuxt Image options object.
	No specific configuration is required for Prismic support. You just need to specify `provider: 'prismic'` in your configuration to make it the default, or pass it directly when you need it, for example:
	```html
	<nuxt-img provider="prismic" src="..." />

[pi0]

Perf: We serialize modifiers to operations and use parseQuery in return statement! (postponing since it is mostly a utility refactor for all providers with operationsGenerator)