refactor(schema_derive): use error emitter instead of bailing out early #5131
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This PR does applies a refactor to use an error emitter instead of bailing early in the iroha_schema derive macros, like was done in #3897.
The second commit is just a drive-by refactor removing some code duplication in where clause generation.
This is in preparation for a PR adding smart trait bound derivation (#5130).