binding: Improve validation rule error message

[unknwon]

Component

Middleware

Middleware

https://github.com/flamego/binding

Is your feature request related to a problem? Please describe

When using validation with the binding package, only the failed rule is returned to the client, e.g.

{"error":"Key: \"Lottery.WinnerCount\" Error: Field validation for \"WinnerCount\" failed on the \"gt\" tag"}

However, the one important element is missing, which is the expected range of values.

Describe the solution you'd like

The error message should contain the range of expected values.

Describe alternatives you've considered

n/a

Additional context

No response

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