fix: improve error handling of invalid Avro identifier #6239
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Description
fixes issue where using a column name in ksqlDB that was incompatible with Avro, e.g. one that starts with a numeric, either wasn't detected at the time the statement was issued (in the case of C* statements), or returned a ambiguous error message (in the case of C*AS statements).
Testing done
Usual
Reviewer checklist