Implementation crate for ReifyDB derive macros. Holds the parsing, validation, and codegen for FromFrame (and
the family of related derives) so the public proc-macro crates - reifydb-macro, reifydb-derive, the future
reifydb-client-derive - can re-export a single shared expansion. Application code never depends on this crate
directly; depending on it creates a proc-macro dependency that the public crates already satisfy.