refactor: Lower type-refs before type inference This refactors how we deal with items in hir-def lowering. - It now lowers all of them through an "ExpressionStore" (kind of a misnomer as this point) as their so called *Signatures. - We now uniformly lower type AST into TypeRefs before type inference. - Likewise, this moves macro expansion out of type inference, resulting in a single place where we do non-defmap macro expansion. - Finally, this PR removes a lot of information from ItemTree, making the DefMap a lot less likely to be recomputed and have it only depend on actual early name resolution related information (not 100% true, we still have ADT fields in there but thats a follow up removal).
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