chore: derive Copy on LoggingKind and LoggingLevel

[arendjr]

Summary

Deriving Copy makes it so that types can be copied without needing to explicitly call .clone(). This makes the type a little easier to work with, and also indicates there is no hidden performance cost to copying it. As such, it should only be derived on types that don't require allocations. For enums where the variants have no custom fields, deriving Copy is generally safe, as long as no future variants with custom fields are anticipated either.

See also: https://doc.rust-lang.org/std/marker/trait.Copy.html#when-should-my-type-be-copy

Test Plan

CI should remain green.

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