cyclic import between validator and model packages

[spolti]

What would you like to be added:
Custom Structs, to be validated, needs to be registered in the validator in order to get executed.

Example:

type CallbackState struct {
    // Defines the action to be executed
    Action Action `json:"action" validate:"required"`

To get this validated, there is a need to register the custom struct here:
https://github.com/serverlessworkflow/sdk-go/blob/main/validator/validator.go#L28

Something similar to https://raw.githubusercontent.com/go-playground/validator/master/_examples/custom/main.go

But, the way that the packges are structured, it will lead to a cyclic import error:

package github.com/serverlessworkflow/sdk-go/v2/model
        imports github.com/serverlessworkflow/sdk-go/v2/validator
        imports github.com/serverlessworkflow/sdk-go/v2/model: import cycle not allowed

Why is this needed:

Allow custom structs to be validated.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[ricardozanini]

@spolti is this still valid?

[spolti]

I am not sure, need to revisit it.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[spolti]

@ribeiromiranda Hi, it seems that your last PR is going to address this problem, can you please confirm?

[ribeiromiranda]

@spolti Yes. Solve this problem.
The register the custom struct now is inside package model in files *_validator.go.