lang: Fix adding derives and reprs to type alias definitions

[acheroncrypto]

Problem

We're adding derives and reprs to all definitions (struct, enum and type) in declare_program!:

anchor/lang/attribute/program/src/declare_program/common.rs

Lines 268 to 270 in 806f214

	#attrs
	#repr
	#ty

However, as reported in #3490, this doesn't work with type aliases, and you get a compile error:

error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s

Summary of changes

Fix incorrectly adding derives and reprs to type alias definitions. In other words, only add derives and reprs to struct and enum definitions.

Fixes #3490

[vercel]

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