The easiest way to do this is Download Toad for MySQL, which is free, and create your own query to the mysql information_schema internal database. You can add columns for the query below. Then select all the results and export as csv using TOAD.
use information_schema;
desc columns
select c.table_name, c.column_name, c.data_type from c columns where c.table_schema = "mydatabaseinstance";
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