Revise core.convert Converter SPI to not a throw checked Exception for the typed convert method [SPR-6138]

[spring-projects-issues]

Keith Donald opened SPR-6138 and commented

Converters can be called directly by application code, or other code other than a ConversionService facade. Therefore the central convert operation should not throw a general Exception type but rather declare a @throws IllegalArgumentException in the JavaDoc instructing the developer to throw a RuntimeException after a conversion failure.

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Affects: 3.0 M4