NIFI-7909: Change DataTypeUtils.toInteger() to use Math.toIntExact()

[mattyb149]

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Using intValue() on a Long object can cause the value to be truncated/misrepresented. However no error is thrown by NiFi, leading to unexpected results. If a number is too big to fit into an integer field (even though the schema says the field is of integer type), then an exception should be thrown, for proper handling of the arithmetic overflow. Java's built-in Math.toIntExact() does exactly this.

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[MikeThomsen]

+1 LGTM. Put your id field into groovysh and roughly tested the functionality and it raises the expected exception.