[FEATURE REQUEST] Getter/setter for attribute 'importance'

[LdDl]

Is your feature request related to a problem? Please describe. Currently field

type Vertex struct {
    ...
    importance    int
        ...
}

is unexported. For extended debugging in external appliactions and import/export function we need to make getter/setter for it.

Describe the solution you'd like and provide pseudocode examples if you can Pretty simple getter/setter combo:

func (vertex *Vertex) Importance() int {
    return vertex.importance
}
func (vertex *Vertex) SetImportance(importance int){
    vertex.importance = importance
}

Describe alternatives you've considered and provide pseudocode examples if you can Nope

Additional context Nope