feat: Resolve arguments to attributes

[jfecher]

Description

Problem*

Resolves

Summary*

Changes the design for attributes a bit:

• Previously all arguments must be Quoted, now arguments are not quoted by default and you need an explicit quote { .. }.
• Arguments of type TraitDefinition are automatically resolved as trait definitions instead of expressions. We can expand this check to more built in types in the future.
• Use a new #[varargs] attribute to determine whether an attribute is varargs instead of just checking if the last argument is a slice. The old check doesn't work anymore since attributes can accept slices as normal arguments now.
• Arguments to attributes are elaborated in the scope of the caller like normal arguments. The scope of the caller will be the global module scope in this case.

Additional Context

Most of the changes in this PR are me moving functions from elaborator/mod.rs to the more appropriate file elaborator/comptime.rs

This lets us derive from other modules without the trait and function name needing to be visible in derive's module. I've updated the derive test to show this.

Looks like there's a new error I didn't know about when adding derive to the stdlib, so that is still blocked..

Documentation*

Check one:

• No documentation needed.
• Documentation included in this PR.
• [For Experimental Features] Documentation to be submitted in a separate PR.

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.