[feature]add support for kingbase(mysql mode) #333
Description
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It's not possible to connect to a Kingbase database(mysql mode) using r2dbc-mysql right now.
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When Kingbase runs in MySQL mode, I hope to be able to connect to the database and perform related operations in my Java service using r2dbc-mysql.
Additional context
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Kingbase is a domestically developed Chinese database, built on PostgreSQL, and also has the ability to operate in MySQL mode.