Support const enums

[bangbaew]

When I used Swaggo, I was able to do something like this:

type PaginationModel struct {
	Search   string  
	Take     int  
	Page     int    
	SortOrder SortOrder
}

type SortOrder string

const (
	SortOrderAsc  SortOrder = "asc"
	SortOrderDesc SortOrder = "desc"
)

this is the result: I was able to select an enum from the dropdown list in Swagger UI.

But when I try this in fibers

type PaginationModel struct {
	Search    string    `query:"search"`
	Take      int       `query:"take"`
	Page      int       `query:"page"`
	SortOrder SortOrder `query:"sortOrder"`
}

type SortOrder string

const (
	SortOrderAsc  SortOrder = "asc"
	SortOrderDesc SortOrder = "desc"
)

it gives me a stack overflow

runtime: goroutine stack exceeds 1000000000-byte limit
runtime: sp=0xc020680360 stack=[0xc020680000, 0xc040680000]
fatal error: stack overflow

I tried using validate:"oneof=asc desc", it didn't render a dropdown list, and it would be painful to enter every value if I have a lot of const enums, for example: database table fields.