Meta-Annotations for @Column and @CustomValueType

[g-sg-v]

Review comments fixed:

• simple test;
• Annotations.java moved to util module;
• comment about search added.

[nvamelichev]

Let's add a @StringColumn meta-annotation that is equivalent to

@Column(customValueType=@CustomValueType(
    columnValueType=FieldValueType.STRING,
    columnClass=String.class,
    converter=StringValueConverter.class
)

?

This will allow fun like @StringColumn UUID uuid fields in entity classes :-)

[nvamelichev]

Maybe also make @CustomValueType usable in a meta-annotation?
E.g.: you will be able to add @StringValueType annotation for on class, and that will be <=> @CustomValueType(..., converter=StringValueConverter.class)

You would only need to touch CustomValueTypes.getCustomValueType() method to do that, I think:

-        var cvt = columnCvt == null ? rawType.getAnnotation(CustomValueType.class) : columnCvt;
+        var cvt = columnCvt == null ? Annotations.find(CustomValueType.class, type) : columnCvt;