Notify the CDC Client if streaming stopped due to exception

[azexcy]

Related #22500.

Changes proposed in this pull request:

• When streaming job failed, send error result to CDC Client
• Add tinyint decode at MppdbDecodingPlugin

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[azexcy]

refer https://docs.opengauss.org/en/docs/3.0.0/docs/BriefTutorial/data-types.html tinyint

int,smallint,tinyint from JDBC, They are all java Integer types.