Introduce uniform GenericConverter interface within the GenericConversionService implementation [SPR-6139]

[spring-projects-issues]

Keith Donald opened SPR-6139 and commented

Currently the GenericConversionService implementation indexes Converters and ConverterFactories directly under these specific SPI interfaces, and has a nasty if/else block for special-case "generic converters" that require full access to the source/target property binding context (via TypeDescriptor). We should introduce a uniform GenericConversionService all type converters are indexed under in the GenericConversionService, including user-defined Converters, ConverterFactories, and special-case GenericConverters.

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Affects: 3.0 M4