Add first-class support for `msgspec`

[dhirschfeld]

Feature Request Type

• [x] Core functionality
• [ ] Alteration (enhancement/optimization) of existing feature(s)
• [ ] New behavior

Description

As a user of msgspec I'd like to be able to also use it with litestar and strawberry.

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[dhirschfeld]

Similarly to https://github.com/strawberry-graphql/strawberry/issues/2181