Prisma Client: make clientExtensions GA

[Jolg42]

• Check issues with clientExtensions topic tag
• Check https://github.com/prisma/client-planning/issues/262
• Check Preview feature feedback: Prisma Client Extensions #16500

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• Features/improvements
  • additive, can be done later Ability to extend PrismaClient class w/ Client Extensions before instantiation #18628
  • breaking, we could do before GA PCE: Improve runtime types in raw query extensions #18125
  • Client Extension: Make .prismaVersion.client available on "@prisma/client/scripts/default-index" #18829
  • See board https://github.com/orgs/prisma/projects/112/views/18

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• Bugs
  • Confirmed
    • Extensions incorrect typings generated (casing) #17405
    • Client extensions in interactive transactions are bound to the base client #17948
    • $runCommandRaw is not passing the expected data to middleware or client extension #18092
    • [ClientExtensions, TypeScript] Fields of custom type aren't available when using the ClientExtensions preview-feature, unless select'd explicitly.  #17388
    • Not a blocker: Prisma.validator: with clientExtensions enabled, Typescript can no longer compute types #17767
  • To reproduce
    • Client extensions: $allOperations limitations docs#5057
    • Client Extensions messes with Object.hasOwn #17837
    • VScode behavior is very slow while using clientExtensions #17843
    • Cannot create record with Prisma.DbNull when clientExtensions enabled #18854
    • Sequential transactions run out of order when using client extensions and middleware #18276
    • Extended client raw queries fail when using the Prisma.sql helper #18875
  • To Close?
    • can be closed Data always unresolved Promise when using xprisma async compute #18300
    • Extend Prisma Client #7161
    • [Proposal] Prisma Client Extensions #15074

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• Docs
  • Update docs
  • document limitation first Client extensions for $allModels fails to infer type of generic model T #17991
  • Create a how to publish an extension guide?
    • Blocked by Client Extension: Make .prismaVersion.client available on "@prisma/client/scripts/default-index" #18829
  • [Feature request] Extend Prisma client model types to include client extension properties docs#5058
  • Prisma Client Extension: support Prisma.validator #18943

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• Deprecate preview feature flag
• Inform and close Preview feature feedback: Prisma Client Extensions #16500
• Anything else?

#15074