New is factory method for vulnerability severity selector.

Equal decoration: Severity of candidate should be equal to the expected severity.

Gt decoration: Severity of candidate should be greater than the expected severity.

Gte decoration: Severity of candidate should be greater than or equal to the expected severity.

Kind of this selector.

Lt decoration: Severity of candidate should be less than the expected severity.

Lte decoration: Severity of candidate should be less than or equal to the expected severity.