#363 Sink connector MySQL dialect - Using data type TEXT

[MrTrustworthy]

Switched the column type of STRING from VARCHAR(256) to TEXT

Corresponding issue is https://github.com/confluentinc/kafka-connect-jdbc/issues/363

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[rhauch]

This needs to be rebased since #333 has been merged, but it still should be a valid fix.

[madnight]

@MrTrustworthy can you rebase this MR?

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