[FLINK-36565] Route module allows merging Decimals with various precisions #3651
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This closes FLINK-36565.
Currently, table-merging router does not allow coercing
Decimalfields with different precisions from upstream, which means some lossless conversions are actually not possible, including:TINYINT,SMALLINT,INT,BIGINTtoDECIMAL(p > 17, s >= 0)DECIMALto high precision onesI've baked some changes from #3636 (FLINK-36474) into this PR since there are some common changes between them.