go-playground / validator / 14502637003

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add support to tag validateFn (#1363)

## Fixes Or Enhances

This Pull Requests adds a new tag called `isvalid`

If the field is marked with the validator tag `isvalid`, the type must
implement the interface `Validate() error` and the return must be nil to
be considered `valid`

A possible use case is: when dealing with Enumerations, the type can
support a method `Validate() error` to check if the value is in specific
the range defined. If we use
[enumer](https://github.com/dmarkham/enumer) it generates a `IsA<Type>()
bool` method that can be used to verify if the enumeration is valid or
not, instead force the `oneof` tag (that needs to be always updated when
we add one new value.

I wrote a pull request to add a Validate method on enumerations
[here](https://github.com/dmarkham/enumer/pull/102) and the interface
`Validate() error` seems pretty common.

It may clash with existing tags that people may register, this is
something that I don't know how to solve.

**Make sure that you've checked the boxes below before you submit PR:**
- [X] Tests exist or have been written that cover this particular
change.

@go-playground/validator-maintainers

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Co-authored-by: nodivbyzero <nodivbyzero@gmail.com>

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