Add guide to Prisma type system

[keerlu]

Describe this PR

This is a draft of a guide to Prisma's type system, explaining how to use native type attributes when introspecting or migrating.

Changes

What issue does this fix?

Fixes #3352

Any other relevant information

[vercel[bot]]

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Name	Status	Preview	Updated
docs	✅ Ready (Inspect)	Visit Preview	Nov 25, 2022 at 3:36PM (UTC)

[github-actions[bot]]

This PR changes the following pages (Vercel Preview Deploy links):

Changed Vercel links

• /docs/guides/database/prisma-type-system (currently)

(Note that links will only be valid after Vercel preview deploy succeeded)

[eviefp]

For completeness, would it be worth mentioning enums as well?

[keerlu]

For completeness, would it be worth mentioning enums as well?

Sorry, missed this comment before - thanks, merging as is but will think about whether to add enums later