Add missing type converters for native target type conversion. [DATAMONGO-2328]

[spring-projects-issues]

Christoph Strobl opened DATAMONGO-2328 and commented

Eg. converters for Date -> Long or String -> Code

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Issue Links:

• DATAMONGO-889 Missing field and property annotations do not allow conditional conversion

Referenced from: pull request #773, and commits 69a4217, 0804061, 0a0ee41, bcb135b